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- Bo-won comes out from hiding and returns to the company. He tells Director Ko that Zero Nine has begun to develop real feelings, but the Director replies that he will not allow that to happen. He locks Bo-won in the lab to prevent him from meeting the robot. In-hyuk finds Zero Nine/Young-gu sitting alone at the park and tries to shut him down but is unable to. Young-gu returns home to check on Da-da. Yoo Jin was exploring the drama concept with her when he came, and backs Young-gu’s relationship with Da-da. Young-gu asks Da-da if she still needs her, but he nearly wets her workstation. An enraged In-hyuk confronts Bo-won at the lab for removing Zero Nine’s input code. Desperate to get Zero Nine to Diana’s, he gets her to go down personally. Wang-joon invites Da-da to the restaurant for dinner, but Young-gu, sensing something unpleasant, pleads for her not to go. She ultimately leaves, leaving him heartbroken. Wang-joon proposes to Da-da, but she tells him she broke up with him not because of the flower boxes, and is unable to accept him yet. Da-da finds Diana and In-hyuk along with Ran at her house, and witnesses Diana kissing a heavy-hearted Young-gu. (en)
- Zero Nine immediately loses his memories of Da-da as a result of the kiss and moves to live with Diana. She gives him a new name, Ken, after her childhood friend, and dresses him up. Ken witnesses Diana hurting one of her maids when she makes a mistake, but does not admonish her. Wang-joon reveals the real reason of Da-da’s breakup to Yeo Woong, who advises him to confess to her. Bo-won convinces Director Ko not to send Zero Nine to Diana, but In-hyuk reveals that he has already done so and fires him. Bo-won visits Da-da and tells her the only way she can get Young-gu back is to kiss him. Da-da drives to Diana’s mansion and tries to get Ken/Young-gu to recall his memories of her, but fails to kiss him and falls into the fountain. Yeo Woong encounters Bo-won at the park and saves him from falling, and they inadvertently kiss. He is embarrassed and runs off. At Da-da’s house, Bo-won reveals to her the truth about Diana and why he stole Young-gu in the first place. Wang-joon finds Ken/Young-gu with Diana while returning his clothes, but Ken/Young-gu has no recollection of him. He sees Da-da going after them to a rooftop bar and helps her out. Da-da prevents Ken/Young-gu from jumping off the building after Diana tells him to, but Ken/Young-gu is unappreciative. (en)
- Yeo Woong and Bo-won are married, and the latter has become an electronics technician in a neighbourhood with Yoo Jin serving as his assistant. Bo-won finally catches up with In-hyuk, who he hasn't met since his sacking, and they make amends. Da-da returns home to do the household chores. However, she still misses Young-gu from time to time. Kyu-ri drops by Da-da's house for a chat over supper, and encourages her to voice her feelings out. As Bo-won closes shop for the night, Da-da visits him and requests to fix the toy her late father gave her as a present. Wang-joon invites Da-da and her team to the States to join him in his new project. She turns down the offer, as she wants to stay and hone her skills before expanding her career internationally. Da-da enters Young-gu's room ever since she locked it, and yearns the times she spent with Young-gu. The next day, Bo-won takes Da-da to the lab to see Young-gu for one last time. The company has preserved his body for research, and now that it has been completed, his body will be flown to the head office to be scrapped. Da-da bids Young-gu a final farewell. Director Ko promises her the company will strive to create a better world she and Zero Nine envisioned. As Da-da walks on a snowy day, someone shields her with an umbrella. (en)
- Da-da asks Young-gu to release her, and gets a nasty fall. Da-da wakes up late the next morning and rushes out of the house without breakfast, so she instructs Young-gu to stay inside and not cause trouble for her at work. Da-da is assigned to work for an arrogant rookie star Hwa-ni in a commercial, which Wang-joon is starring, but refuses to continue doing the makeup mid-way when Hwa-ni badmouths Wang-joon. Hwa-ni confronts Da-da at the set. Young-gu shows up in a hanbok and shoves him away. On an impulse, she asks Young-gu to leave the set. Wang-joon requests for a role change so Hwa-ni becomes the lead in the commercial. Young-gu takes Da-da home when it rains, since she forgot to bring an umbrella with her. At home, Young-gu pleases Da-da when he shows the record player as well as other household appliances he had repaired while she was away. Wang-joon asks Yeo Woong to investigate the man in the hanbok who showed up that afternoon. Director Ko is horrified when he finds out that Zero Nine’s dating mode has been activated. He receives a call from Ms. Park Ran , who informs him Diana is hurrying him to deliver her robot. Park, who works for Diana, relays the Director’s message to her saying that the robot would be ready by the following week. Diana is irritated when one of her maids touched her doll, and proceeds to make her a living doll. Bo-won, who remains in hiding, dresses up as a woman to visit his former colleague Hwang In-hyuk , who gives him money and a burner phone. (en)
- Da-da reminds Wang-joon that they are not dating anymore, so he should not care about her relationship with Young-gu. Young-gu follows an upset Da-da inside; she tells him to stop calling her “Girlfriend”. On the last day of filming for Wang-joon's drama, he views the CCTV footage of the commercial shoot provided by Yeo Woong, and realizes that Young-gu was the man in the hanbok. He makes Da-da redo the makeup for the final showdown scene and delays filming. Da-da realizes she has left the dummy heart she has made the night before at the studio, so she gets Young-gu to deliver it. Despite a minor accident, he shows up eventually, saving the shoot and her reputation. Filming finally wraps up, although Wang-joon asks Da-da to stay to remove his makeup, which she declined. He returns to the dressing room and opens up a black flower box from the fan gifts, threatening him to break up with Da-da. Because of the physical impact with a forklift while on the way to the set, Young-gu’s shoulder overheats and he shuts down. Without help from Bo-won, a flustered Da-da tries to restore Young-gu, which she eventually succeeds. Young-gu takes Da-da out to the top of the hill behind her house for some stargazing. Grateful to have him around for the past week, she acknowledges him as a high-end boyfriend, before they go back for the night. (en)
- Young-gu follows Da-da to Wang-joon’s residence. He sees her tending to Wang-joon, who has fallen ill. She puts him to rest and prepares porridge for him. Wang-joon tells Da-da the truth about the flower boxes, and begs her to come back to him. Young-gu clears the broken glass in the spare room and leaves for Wang-joon’s house. Along the way, he meets Bo-won, who gives him a cap to hide himself. Young-gu asks him what happens if Da-da fell in love with someone else, but Bo-won hurries him to Wang-joon’s house. Young-gu earlier gets a lead on who the culprit behind the flower boxes might be, and informs Wang-joon. Kyu-ri slips onto Bo-won’s towel at a jjimjilbang where he is staying and slaps him when he tries to do CPR on her. After a meeting with the PD, Kyu-ri finds that Da-da is lethargic, and she gives the latter advice on how to rekindle a failed relationship. At the celebrity agency, Wang-joon and Young-gu find Hwa-ni wearing a ring similar to the one the temp had sketched, and he points to its original owner, Mr. Geum. Geum shows his true colors and reveals himself to be the perpetrator who unscrupulously desires to keep Wang-joon away from Da-da, and Wang-joon quits the agency. Yeo Woong, who came to claim her medical bills, meets up with Wang-joon and learns about Geum’s misdeeds. Young-gu drives Wang-joon home, but Wang-joon tells him that Da-da does not need Young-gu anymore. (en)
- Young-gu eventually confesses to Wang-joon he isn't human. The latter warns Da-da to be wary of Young-gu, and decides to go down to her house to find out for himself. While analysing Young-gu at home, Bo-won reminds him to keep his identity a secret to others so he won't be returned to the head office. However, he carelessly leaves his tablet there. Wang-joon finds the tablet containing Zero Nine's manual, and learns that Young-gu is indeed a robot. He questions Da-da, who reveals the truth. Wang-joon is unable to accept giving Da-da up for a robot boyfriend. Director Ko informs Bo-won about Diana and Zero Ten. As soon as Bo-won leaves to pick up his tablet from Da-da's house, In-hyuk hands the Director a disciplinary notice from the head office regarding the handling of Zero Nine, and blames Bo-won for it. Bo-won learns that Wang-joon has learnt about Young-gu's identity. Hwa-ni invites himself to the set and taunts Wang-joon about his relationship with Da-da. Wang-joon loses his temper and punches him, only to be stopped by Yeo Woong, Da-da and Bo-won. Yeo Woong assures Bo-won that he can trust her, for she won't reveal his secret. Hwa-ni is badly injured, and together with Geum, they hold a press conference to frame Wang-joon for their injuries. Wang-joon tells Da-da he will keep her away from Young-gu. They learn about the scandal, and Wang-joon moves into Da-da's place for the time being to avoid the reporters. Meanwhile, In-hyuk offers to check on Zero Ten for Diana. (en)
- Wang-joon, along with Yeo Woong and Mr. Geum, attend a meeting with the PD and his assistant at the TV station to discuss the second season of his drama. He insists the PD sign Da-da and her team on to continue providing the makeup for the drama. Young-gu helps Da-da to save on her household expenditure by using him as a power source. He notices a promotion at the supermarket, so he takes Da-da there. While there, he stops Da-da from splurging on unnecessary products, and also learns more about human traits. Da-da passes by a coffee product display which Wang-joon is an ambassador, and Young-gu notices that she is upset at the sight of Wang-joon. Da-da is called to meet the PD at the station for the drama project, and meets Wang-joon there. He invites her for dinner at their favourite restaurant, because he has something important to say to her. Young-gu picks Da-da up and presents her with a pair of tickets to a Han River cruise he got in a giveaway, which happens to be at the same time as Wang-joon’s dinner date. At the ferry terminal, Da-da tells Young-gu she needs to rush for something else, and hurries off. However, Wang-joon had already left for the hospital when he learns that Yeo Woong was involved in a car accident taking a frail Bo-won there. Da-da, who waited for Wang-joon to come at the restaurant, lies that she did not show up and asks him not to seek her out on the drama site. (en)
- After delivering the toys to the store, Young-gu takes Da-da home and presents her an advert for a drama club assistant position at a middle school. He observed the paint on the soles of Bo-won and Da-da's shoes and deduces that anyone who entered the room had contact with the red paint on their outsoles. He goes back to the set to investigate the accident and runs into Wang-joon; with none of their shoe sizes matching those of the culprit, they decide to work together to find the real culprit and get Da-da's job back. Da-da, who is a senior of the drama club, signs up for the assistant position, and makes natural makeup products for the play the next day. Young-gu has been resisting his desire to sleep with her and decides to wait a while more before he does. Da-da arrives at school, but the play has been delayed, so she entrusts the makeup products to the club member. Wang-joon gathers the crew members to apologize for delaying the shoot, and gives them free shoes. With Young-gu's help, he identifies the culprit and takes him to his dressing room. The crew member confesses he was told by Geum to spike Da-da's makeup product. Da-da returns to the set and declares to Geum she is returning to the team. Wang-joon has Geum apologize to her, clearing Da-da's name. Wang-joon and Yeo Woong officially release the celebrity's departure from the agency and kick Geum out of the set. In a bid to avenge himself, Geum elevates Hwa-ni to top star status. Wang-joon begins to question Young-gu’s true nature when he accidentally spills tea on Young-gu, but doesn't scald him. (en)
- Young-gu passes out after getting out of bed, scaring Da-da. She gets Bo-won and Director Ko to restore him, and learns from the both of them that Young-gu/Zero Nine has been overloaded with learning human emotions and that accelerated his meltdown. Despite Bo-won and Da-da’s objections, Young-gu insists on going for the picnic, only to show more errors. Da-da decides to postpone the picnic so that Young-gu gets more rest. The Director tells her they can exchange the parts affected by the meltdown, but if Zero Nine continues to learn human emotions, the meltdown will continue. Bo-won blames himself for not knowing about Young-gu’s breakdown but egging him on to become more human and to love more. Diana learns from In-hyuk about Zero Nine’s meltdown. The Director urges In-hyuk to make amends with Bo-won, who had petitioned the head office to take him back to the company. Despite Ran’s pleads for Diana to give up her revenge plan, she insists on doing so and boots her out of her room. Wang-joon senses something amiss when he learns that Young-gu and Bo-won had resigned, and finds Da-da distracted during filming. Da-da breaks down when her phone stops working, overwhelmed at the prospect of losing Young-gu. She is upset because there is nothing she can do for him. Yeo Woong also learns that Young-gu has fallen ill, and consoles Bo-won. Kyu-ri and Yoo Jin offer to help cover Da-da’s duties in the drama production for the time being so she could take care of Young-gu. (en)
- On Da-da’s last day with Young-gu, she receives a call from Bo-won reminding her he is going to pick Zero Nine today. But Bo-won has other plans; he plans to abscond with the robot to Guangzhou via boat to meet up with a professor there. Young-gu/Zero Nine leaves with Bo-won after he fixes a wall panel at home, but he finds a location tracking device installed in Bo-won’s car and they escape. Director Ko and In-hyuk, who is revealed to have returned to the company, pursue Zero Nine, but catch Bo-won instead. Bo-won confesses that he refuses to send Zero Nine to Diana and lose him like before. He runs off and gets into a near accident. Back in the lab, the Director finds out Bo-won’s intentions, and with In-hyuk heads to Incheon Port to catch Zero Nine. Yoo Jin sends Da-da to the TV station to return the drama props. While cleaning them, she sees Wang-joon doing an interview, where he claims he doesn’t have a girlfriend. While reminiscing Young-gu at home, Da-da receives a message from Bo-won to pick Young-gu up at the port. In the heavy rain, Young-gu tells Da-da that his system is going to reset soon and he will lose all his memories of her, but she prevents him from shutting down. (en)
- Bo-won presents Zero Nine’s ownership contract to Da-da. The Director reports to Diana that she has breached the contract for security reasons. She plans revenge on Ken/Young-gu. Bo-won passes himself off as the new employee of Da-da’s makeup team, much to Kyu-ri’s dismay. The team heads to the set, where Young-gu is eager to tell Da-da about his new job. Wang-joon attempts to tell Da-da that Young-gu is two-timing, but she replies that he had his own reasons for doing so. Bo-won and Yoo Jin share a close bond with their similar interests. The former accidentally spills the fake blood in the room so Kyu-ri orders him to clean up. Bo-won bumps into Yeo Woong at the set and he tells her to forget their recent encounter. While rehearsing for a scene with a real prop, Wang-joon rips Young-gu’s pants, but doesn't injure him. Geum, an unwelcome visitor, pops by the set. Geum has not given up in trying to separate Wang-joon and Da-da, even though the actor had quit his agency. He sends someone to spike Da-da’s makeup products. Wang-joon overhears Bo-won and Young-gu’s conversation, and begins to grow suspicious about Young-gu. Da-da learns from Yeo Woong about Geum and his threat. Wang-joon develops an allergic reaction from the makeup that Da-da did and is sent to hospital. As the PD assembles the crew for a meeting, Geum steps forward and slaps Da-da. (en)
- Everyone at the set is surprised to hear Wang-joon’s announcement about his seven-year relationship with Da-da. He decided that he will not end up losing Da-da to Young-gu, who experiences an excruciating pain when Wang-joon leaves the set. Geum is convinced to give up his act after news of Wang-joon’s press conference breaks to very positive response. That night, Da-da prepares offerings for her late father’s memorial service. Young-gu, Bo-won, Wang-joon and Yeo Woong join her in paying respects. Yeo Woong is frustrated by the reporters bugging her about Wang-joon’s relationship. Bo-won gives her an excuse for appearing at Da-da's house, claiming he wanted to protect her. Wang-joon asks Young-gu to do nothing else to Da-da other than protect her. Da-da teaches Young-gu the dance she danced with her father while he was alive. At the set, Yeo Woong invites Bo-won for bento lunch. Wang-joon hopes Da-da will reconsider dating Young-gu, because Young-gu will never grow old. Diana, who is still seeking revenge on those who deserted her when she was trapped in the fire, is bent on destroying Ken/Young-gu. Young-gu suddenly blacks out after having his makeup done. Da-da gets Bo-won to fix him, and reveals to Kyu-ri, Yoo Jin and Yeo Woong that Young-gu is a robot. (en)
- Young-gu makes winter and spring come early for Da-da, since she mentioned she wanted to experience them with him the previous night. He sends Da-da out for work, but continues to keep his true emotions to himself. After hesitating for a while, Yoo Jin decides to tell the truth to Da-da, but his words end up falling on deaf ears to Kyu-ri, who thinks he is confessing his love to her. While Da-da does Wang-joon's makeup, he reveals to her Young-gu never went to the head office. Diana, who is departing for New York to receive psychotherapy, visits Young-gu at home to apologize for breaking the cooler. However, he contradicts himself when he tells Diana about his condition. Devastated upon learning that Young-gu hasn't been fixed and his days are numbered, Da-da loses control of her emotions and begs him not to leave her alone. (en)
- Young-gu overhears Mr. Geum on the phone trying to find someone to be Wang-joon’s manager for a month, so he offers himself for the job, though Wang-joon was initially reluctant to hire him. Da-da refuses to let Young-gu be Wang-joon’s temporary manager, claiming that he will be easily discovered, but he assures her that he won’t get caught. While Da-da visits Yeo Woong at the hospital, Bo-won visits Young-gu at home to find out how he is doing, and also for a shower and some food. Young-gu tells him he's got a job as Wang-joon’s manager to help Da-da as well as to find out more about the celebrity. Diana sees her maids watching a video on Wang-joon’s free hugs event, but fails to notice Zero Nine. Young-gu heads off to his first day of work as Wang-joon’s manager. Mr. Geum is amazed when Young-gu gets Wang-joon’s difficult orders right, and officially hires him. Director Ko and In-hyuk get a lead in finding Zero Nine that takes them to Da-da’s special effects studio, and pass themselves off as detectives investigating a serial killer case. While analyzing Wang-joon’s residence, Young-gu comes across the model cake, which Wang-joon had kept. Wang-joon tells him that his relationship with Da-da was longer, and that she doesn’t have feelings for Young-gu, she just needs someone by her side. (en)
- An embarrassed Wang-joon asks Yeo Woong not to plan any more free hugs events. Yeo Woong has no idea Da-da and Young-gu would be there, and wonders if the both are dating. Young-gu’s performance earlier during the day impresses the lady boss and she gives him a bonus. Da-da waits for Young-gu at a bench and is joined by Wang-joon, who asks if she is feeling better. Young-gu takes her home, but Da-da could not find her wallet and they go back to the amusement park to find it. They had fun at the amusement park, and Young-gu delights Da-da when he presents a drone light show to her. Meanwhile, Yeo Woong finds out about the flower boxes and confronts Wang-joon, who was upset after seeing Da-da and Young-gu together. However, he does not want to tell Da-da about them, which were first given to him at the award ceremony, and that he does not intend to let her go. Back home, Young-gu turns off the lights to save electricity and gives Da-da his pay. When asked if him being a grown man is supposed to mean, he goes near her but she turns away. (en)
- Wang-joon learns from Yeo Woong about Young-gu’s condition. He drives to Da-da's house, and reminds her she would have a hard time taking care of Young-gu and worse things will crop up to him. Da-da, already feeling miserable, asks him to stop raking the issue and leave. Bo-won reports to the Director he has found a way to cure Young-gu - a component called the heart-cooler, which was used in one of the European models who also suffered a meltdown. However, due to its hefty price tag, only two such coolers were made, and the remaining one is made solely for research purposes at the head office. The Director sends an official request for approval to the head office, but it was rejected immediately due to the financial damage incurred over Zero Nine's handling, and the cessation of the cooler production. Wang-joon helps to get the cooler delivered by threatening to expose the head office over his impersonation incident. Unfortunately, In-hyuk overhears about the cooler and reports to Diana, who orders him to snatch it from them. Tired of being Diana's lackey, In-hyuk initially quits, but soon returns since she had done a background check on him. Bo-won takes Da-da to the lab to see to the cooler's delivery. The Director drives to Incheon Airport to collect the cooler from a representative from the head office, but In-hyuk intercepts and takes it. Upon receiving the news that In-hyuk stole the cooler, Da-da runs to Diana's mansion and begs her to give the cooler to her. However, Diana still breaks it in front of Da-da, Bo-won and the Director. (en)
- Bo-won and Director Ko regret at Young-gu's decision to let his meltdown run its course and they disable his safeguard mode. Five days pass and Wang-joon's drama begins its run. Young-gu returns to Da-da's side and claims that he's fixed. They have dinner together. When Yeo Woong reunites with Bo-won, she learns that he and Young-gu never went to Switzerland, and that the latter will become scrap. She consoles him. Young-gu is unable to confess his thoughts to Da-da, who invites him to see a meteor shower the next day at Ganghwa Island. Da-da had to miss the meteor shower due to an urgent change in schedule, so she gets Yoo Jin to relay the message to Young-gu. Young-gu drops by Wang-joon's house to bid farewell to him. He asks Wang-joon to take care of Da-da when he's gone. Yoo Jin arrives at Da-da's house, but doesn't find Young-gu, so he leaves a note for him there. Back at the set, Yoo Jin learns the truth about Young-gu's condition from Bo-won and Yeo Woong and is disheartened. Wang-joon invites Da-da over coffee, and tells her he is worried about her and Young-gu. Young-gu doesn't receive Yoo Jin's message and waits for her to return home. He is disheartened that Da-da fails to keep her promise, but she cheers him up by promising to go see it next year. (en)
- Bo-won tells Da-da that Young-gu’s internal mechanisms are breaking down rapidly, and he could stop functioning at any time, but Bo-won is certain Young-gu is forcing himself to move with all his might for Da-da. Young-gu apologizes to Bo-won for not going to the head office, but thanks him for creating him. Da-da takes leave the next day to spend time with Young-gu in his remaining days. They go for a morning jog, have picnic by the park, and have a photo taken together. Da-da hopes that Young-gu will not have any regrets, because she was happy with him around. As it starts to rain on the way home, Da-da leaves Young-gu at the bus stop to buy an umbrella. He reminisces the times spent with her, then shuts his eyes for the last time. Three years pass. Da-da is now the CEO of the makeup team while Kyu-ri is promoted to team leader. Wang-joon’s drama is into the final episodes of its fourth season, and he gets a chance to star in a Hollywood film. Yeo Woong has established her own celebrity agency with Wang-joon under her wing, while Mr. Geum is grooming a new actor to the Korean drama scene. (en)
- Wang-joon takes Young-gu to the gym for a workout. He gets his temp to try out the EMS training system, but Young-gu gets electrocuted and powers down. Da-da, who has followed Young-gu, arrives to shut the system down and they take him to rest. She takes Wang-joon outside to ask why he did that to Young-gu, but he asks if she truly has feelings for the latter. Young-gu regains consciousness so Wang-joon lets him and Da-da go for the day. As they go home, Wang-joon saves Da-da from being attacked by a mysterious man. Young-gu pins down the culprit and takes him to the police station. Wang-joon confronts the culprit there, who denies sending him the flower boxes. Young-gu buys some medicine for Da-da, but gives her the one given by Wang-joon, who knows Da-da’s condition better. Wang-joon receives a call from the perpetrator behind the boxes, who tells him Da-da is going to suffer as a result of Wang-joon. Da-da helps Young-gu write a resume that night. She learns from Yeo Woong that Wang-joon was not at the restaurant the other night because of her accident. Wang-joon and Da-da both spend the night thinking about their past relationship. Young-gu gently puts Da-da to bed, but feels his heart respond erratically. He takes her to see the Sea of Japan the next morning, and he tells her to give him a chance to be loved. (en)
- Da-da reassures Wang-joon that he doesn't have to feel guilty about their breakup, since she was happy while dating him. The other group goes to view the ocean, but Kyu-ri upsets Young-gu by saying harsh words to him. The group have barbecue together by the resort. Kyu-ri confirms that Young-gu and Da-da haven't slept together. Da-da accompanies Young-gu to see the ocean at night. A drunk Bo-won and Kyu-ri contemplate their singlehood. Meanwhile, Wang-joon looks for Young-gu and replies that he lost the war for love, but Young-gu assures him that love isn't all about winning. Wang-joon hopes Young-gu can make Da-da happy. Yeo Woong witnesses Kyu-ri preparing to kiss Bo-won and is about to give him up. However, he joins Yeo Woong and confesses he couldn't forget her, thereby affirming their relationship. The group returns home the next day. Kyu-ri buys apples for Da-da and Young-gu to express her sincere apology for being mean to him, and wishes the best in their relationship. Da-da invites Young-gu to sleep with her for the night. The Director's worst fears about Zero Nine are proven after the head office determines that the robot has become a threat and he informs Bo-won they need to retrieve him. As Young-gu prepares to go out for a picnic with Da-da the next day, he goes breathless and collapses to the ground. (en)
- Da-da returns home, thinking that Young-gu had gone back after the cruise had closed, but does not find him there. She returns to the ferry terminal and gets mad at him for stubbornly waiting there, but realizes he was right when he points out that even though she was late, she did return for him. Mr. Geum visits Yeo Woong at the hospital, and they discuss who will stand in as Wang-joon’s manager while she recuperates, but receive word that Bo-won had left. Young-gu prepares a candlelit dinner for Da-da as a replacement for the missed cruise. She realizes she has begun to love him, but tells him she just likes that he’s near her when she’s going through a hard time. As Da-da returns to her room, Young-gu learns that she is working with Wang-joon again. Diana shows up along with Ran at the company the next morning on a surprise visit and demands to find Zero Nine, but Director Ko manages to cover it up by giving her details regarding the robot, and promises to deliver him as soon as possible. Young-gu takes Da-da to the TV station for work, but unknowingly drops the cruise tickets he kept as a memento. Wang-joon finds the tickets and calls Young-gu inside to return them to him. Later, Young-gu tells Da-da he has found a new job - as Wang-joon’s manager. (en)
- Da-da has to go to work, so Young-gu drives her home to get her ready for the script reading session at the TV station. Da-da turns to Young-gu’s user manual, but finds that there is no such mode for "affection pleading". Young-gu escorts Wang-joon to the script reading session after the celebrity drives Yeo Woong to her home to recuperate. Young-gu asks Wang-joon how he can make Da-da love him. At the session, Young-gu continues to motion for Da-da’s attention. Da-da takes Young-gu to a corner, wondering why he’s feeling jealous, but he demands her to kiss him, so she gives him a peck on his cheek. Yoo Jin witnesses the scene and assumes Young-gu is her secret boyfriend. At dinner with the production team, Wang-joon tries to find out from Da-da why Young-gu denied dating her. Wang-joon finds out from Young-gu the truth about the cruise, and declares to his temp that Da-da will return to him eventually. Da-da awakens to find Young-gu decorating the floor and gets him to clean up. Director Ko and In-hyuk show up at her residence, telling her they’re here to take Zero Nine. (en)
- Da-da and her team discuss with Wang-joon the concept for his android character in the drama. Wang-joon asks Da-da to give him a chance to get her back, because he cannot live without her. Diana tells Ken about the fire that claimed her right hand and how her relatives left a cold shoulder on her. She notices an error in Ken and contacts the Director and In-hyuk to check on him the next day, but they do not find any abnormality. Diana plans to take Ken to the head office in Switzerland the next day to reset him completely, and informs Ran to book their flight. Bo-won sneaks back to the company to analyze Zero Nine’s system, and is discovered by the Director. He tries to convince the Director to let Zero Nine return to Da-da, but is unable to, and finds out from In-hyuk about Diana’s plan. He departs for Da-da’s house and asks her to stop them from leaving, but she claims that her relationship with Young-gu is over now. On the day of the flight, Bo-won barges into Diana’s mansion to prevent her from leaving with Ken/Young-gu, but is subdued and taken away. While reading the book Bo-won had given Young-gu, Da-da realizes she still has feelings for him, and rushes to the mansion to confess to Ken/Young-gu she loves him. Nevertheless, Ken leaves with Diana. In the heavy rain, Ken/Young-gu’s memories with Da-da flood back and he stops the car, declaring that Diana is not his girlfriend. He rushes to Da-da, saves her from a car accident and kisses her. (en)
- Geum blames Da-da for causing Wang-joon’s allergies to show up. Young-gu does not retaliate, but Wang-joon returns and comforts her in front of everyone. The PD decides to cancel the day's shoot to avoid spreading more gossip, and talks to the team. He relays the message that Geum wants the makeup team out. Da-da takes responsibility for the incident and quits the team, entrusting it to Kyu-ri. Wang-joon is visited by Geum while recuperating at home, and learns about Da-da's resignation. The actor, who believes Da-da was innocent, decides to find the real culprit himself. Da-da declares to the team that she and Young-gu are dating. Young-gu asks Bo-won to help him and Da-da find more jobs so as to help with her living expenses. Young-gu consoles Da-da on the loss of her job. Director Ko hopes to restore Bo-won to his position if Zero Nine achieved good results through reports. However, Bo-won is worried that Zero Nine had taken too much toll on his system. The Director learns that a newer model, Zero Ten, has been delivered into the lab. Young-gu and Da-da spend a fun day together, and help make toys for a store together with Bo-won. However, Young-gu feels an abnormality whenever he sees Da-da upset, and privately tells Bo-won about it. Wang-joon shows up at Da-da's house and privately tells her Young-gu may be a suspect in the accident. Diana pops by the company to check on Zero Ten, who was given a face that exists. (en)
- Bo-won reports to the Director, Mr. Ko , that Zero Nine is ready to be sent to his client. He later hacks into the database and learns that the client is Diana , a chaebol heiress who was recently involved in a rage scandal. Diana had previously abused a robot beyond repair to test her loyalty. He argues with the Director, who warns him not to get emotionally attached to the robots. Da-da sneaks into Wang-joon’s house by disguising as an elderly cleaning woman to decorate his living room and watch him win the Best Actor award. She feels down when he leaves her out in his acceptance speech. Nonetheless, she sends him a congratulatory text. Da-da cleans up the decorations, but finds herself stuck in the bathroom when Wang-joon and Yeo Woong bring his agent Mr. Geum and a group of reporters in for an after-party. Eventually, she was discovered and her disguise exposed by the crowd, but, not wanting to reveal their secret relationship, Wang-joon claims that Da-da is his stalker. She is sent to the police station for interrogation, where she confesses she loves Wang-joon. When she is allowed to leave the station, she breaks up with him. Bo-won infuriates the Director by stealing the container containing Zero Nine to a courier delivery van and goes into hiding. The container eventually finds its way to Da-da’s residence, who brings it to the set with Yoo Jin. Da-da learns from Mr. Geum that Wang-joon had requested for a change in makeup artist. Da-da consoles herself on her failed relationship with Wang-joon. She opens the container and thinks Zero Nine is the dummy she has ordered from the US. As she touches the “dummy”, she kisses him by mistake when he topples forward. (en)
- Da-da cringes at the accidental kiss with the “dummy”, who awakens and addresses her as his girlfriend. She runs off the room, and tries to convince Kyu-ri and Yoo Jin that the “dummy” is alive but he disappears. With the dummy gone, Da-da stands in as a dead body required for a scene. On her way out of the set, Da-da panics when she accidentally knocks down the “dummy”, and takes him to hospital. She freaks out when he suddenly wakes up and gets into an accident herself. Da-da is taken to hospital, where she insists that she is not dating the “dummy”. Upon her discharge, she tries to get rid of the “dummy” but to no avail. The “dummy” saves Da-da from an accident, but is pierced himself. Bo-won finds the both of them and sends them to Da-da’s residence to fix Zero Nine. Wang-joon tells Yeo Woong that he and Da-da have broken up. Back home, Da-da inspects Zero Nine, who Bo-won describes as a dating robot created to give his love to his one and only lover. Since Zero Nine’s programming forbids him to leave Da-da, Bo-won leaves her to take responsibility for the robot for a one-week trial period. However, he advises her in private not to fall in love with Zero Nine. Da-da tells Zero Nine that she does not believe in love anymore and goes upstairs. (en)
- At the company, In-hyuk overhears from Director Ko and Bo-won's conversation about Zero Nine's possible meltdown. Kyu-ri, Yoo Jin and Yeo Woong are astonished by the revelation surrounding Young-gu. Kyu-ri, in particular, is unable to accept the fact that Da-da is dating a robot. Geum goes to the set and apologizes to Yeo Woong and an unappeased Wang-joon for harassing him and Da-da. Yoo Jin is amazed by Young-gu's abilities, and appreciates Bo-won for his craftsmanship. However, Kyu-ri doesn't buy it, and thinks Da-da is hiding from reality. Kyu-ri continues to treat Bo-won like a minion, while Yeo Woong shows her feelings for him. Wang-joon escorts Da-da to the set, and tells her there he will wait for her to come back to him. Da-da reminisces the time when her father , who single-handedly raised her from young, advises her on who she should love. As Young-gu arrives to fetch her home, she declares that she loves him, and they share a kiss. (en)
- Da-da wakes up to find Young-gu in only an apron; he is under the mistaken impression that she likes men dressed that way. She receives a call from the PD that Ruby’s botox treatment had gone wrong and they had to delay production. Mr. Geum advises Wang-joon, who had been tired since breaking up with Da-da, to rest for the day. While at home, Wang-joon reminisces the times spent when Da-da hung around his house; he could not forget her. Meanwhile, Da-da spends the day with Young-gu cleaning up the house, where his robotic strength proved handy. Kyu-ri shows up at her house unannounced to deliver some normal clothes meant for the “dummy”, so Da-da tells Young-gu to hide in the bathroom. He is nearly discovered when Kyu-ri had an urge to go to the bathroom; fortunately, he had climbed up the ceiling. Young-gu changes into the normal clothes and accompanies Da-da to do grocery shopping. She prepares lunch, and learns that even though he can eat, he doesn’t need to. Wang-joon goes to Da-da’s house and finds Young-gu there. He accuses him of stalking. Da-da comes out to find Young-gu apprehending Wang-joon, and confesses to the latter that Young-gu is her boyfriend. (en)
- At the mansion, Young-gu fends off Diana's bodyguards and saves Wang-joon, but Diana gets in their way. She threatens them if they don't let things go her way. Young-gu decides to stay to free Wang-joon, who races to stop his impersonator from harming Da-da. Young-gu remarks he feels nothing but sorry for Diana. Bo-won creates an opportunity for Young-gu to escape so he could join Wang-joon. Zero Ten/Wang-joon, upon Diana's orders, drives Da-da out of the city to get rid of her. When the real Wang-joon arrives, Zero Ten strangles him but Da-da stops the impersonator from doing so by kissing him, thereby resetting his memories. Young-gu feels awkward when Wang-joon's lookalike, too, takes Da-da as his girlfriend, so she returns Zero Ten to the Director, who confiscates him from Diana. Wang-joon vows to Diana that he will win Da-da back again. He goes to Da-da's house and privately tells her he will keep her away from Young-gu. Da-da and Young-gu clear Wang-joon's name by exposing Hwa-ni's facade. Wang-joon meets up with Bo-won to clarify about Young-gu. He holds a press conference at the set the next day and announces to the reporters he will be pursuing Da-da again. (en)
- Grateful for having Young-gu around, Da-da takes Young-gu home. Director Ko and In-hyuk arrive at the port, but they were too late. They drive to Diana’s mansion to break the bad news to her, and confess that they need another week for Zero Nine to be ready. Diana, who had lost her right hand in an accident, warns the duo that she wants the robot delivered asap, otherwise she will torment them. Young-gu, who is in full dating mode, wants to date Da-da for real now, but she said she just wanted to stop him from forgetting all the trouble he had caused her. He gives her a ring, which collects data about her emotions. Kyu-ri has found Da-da a part-time job at an amusement park where the latter and Wang-joon dated before. Incidentally, Wang-joon is also headed there for a free hugs event, since the drama was well-received. However, he receives another flower box with more threats to break up with Da-da, but does not tell Yeo Woong about it. Da-da finds out that Young-gu has got another part-time job at the same amusement park, because he wanted to be more useful and help her cope with her living expenses. In-hyuk and his colleague find Bo-won’s belongings and hands them to the Director, and they find a clue in Bo-won’s diary. While carrying the props to the office, Da-da stumbles into Wang-joon, who catches her in his arms at the public event. Seeing Da-da in a dilemma, Young-gu steps forward and hugs a caught-off-guard Wang-joon instead. (en)
- Young-gu reports to Bo-won that he is feeling better now. He becomes certain about his relationship with Da-da and decides to become more confident, but is concerned when she didn't get enough sleep. Bo-won reports his findings to Director Ko, who is concerned about the data analysis results for Zero Nine. Kyu-ri continues to show her opposition to Da-da and Young-gu's relationship, and Bo-won is upset about her not understanding them. Meanwhile, Yeo Woong backs Bo-won for this incident, but claims what happened the day earlier was a misunderstanding. Young-gu invites Da-da out on a date as an ordinary couple after the shoot. Wang-joon is surprised to see Yeo Woong sporting an avant garde look so as to get Bo-won's attention. The crew heads to the countryside for the shoot the next day. Filming for the scenes is completed way earlier than expected, so Wang-joon invites Yeo Woong, Young-gu and the makeup team to go on a vacation at a beach resort. Kyu-ri insists on tagging Young-gu along to buy food so as to bring Da-da and Wang-joon closer. While reminiscing their previous vacations, Wang-joon tells Da-da he is yearning to go back to how they were previously. (en)
- Zero Nine looks through the house and cleans up the place. Da-da names Zero Nine Young-gu, based on his serial number. Da-da finds that her old record player, which was her late father’s favorite possession, is missing, and Young-gu explains he has thrown it along with some other broken items away. She picks up her record player from the recycling center and dumps him there. Young-gu intervenes with an arguing couple and the couple draw a commotion by alleging to the police that Young-gu attacked the lady. A worried Da-da returns to the scene, where she prevents Young-gu from being taken by the cops to avoid paying the company a hefty fine. She identifies an in-car camera from a distance, and resolves the situation. As they pass by a motel, Da-da realizes Young-gu needs some clothes, so they go to the costume storage room in the TV station to take some. Director Ko warns Bo-won via phone call that they only have one week before they send Zero Nine to Diana. Back home, Da-da is surprised when Young-gu shows up in her room unannounced, and he asks if they can sleep together. (en)
- The Director suggests to Bo-won a brilliant idea - to erase all of Zero Nine’s data so he could revert to his original state. Wang-joon learns from Da-da that the cooler is broken. He gets Yeo Woong to comfort Bo-won. Young-gu goes to the lab to repair his left hand. He learns he will have to travel to Switzerland to reset himself completely and avoid his meltdown, but is unable to bring himself to forget Da-da. The Director suggests not to send Zero Nine back to Da-da, but Bo-won has his reservations. As Young-gu/Ken is put to sleep, Diana visits the lab to check if he really died. She is terrified when his hand catches fire, triggering memories of the blaze she was trapped in, and cowers in fear. Ran defies the evacuation orders and goes in to save Diana. She hopes Diana would go back to being the kind person she knows. Worried about the blaze, Da-da rushes to the scene, and is relieved to find Young-gu well. She passes out and is taken to hospital. Wang-joon and the others arrive to visit Da-da. He blames Young-gu for making Da-da sad, and wants him to vanish as soon as possible. Da-da discharges herself from the hospital and consoles Young-gu. He decides to fly to the head office to get himself fixed. On the day of the flight, Young-gu bids farewell to Da-da. However, he backtracks his decision and decides not to go to the head office. He wants to spend his remaining time with Da-da. (en)
- Da-da, Young-gu and Wang-joon have dinner together. However, Wang-joon keeps debating that Young-gu is unable to feel. Da-da reassures Young-gu that Wang-joon being her ex-boyfriend would be the least of his concerns. Wang-joon reiterates that he cannot allow Da-da to love Young-gu and vice versa, but Da-da and Young-gu show their feelings for each other, and he won’t change his love for her either. Wang-joon is unable to sleep, so he drinks his frustrations. Da-da reveals she liked him because of how humane he was. Bo-won visits Wang-joon the next day to apologize for his oversight, and asks him to keep Young-gu’s identity a secret. Young-gu asks Da-da what it feels like to drink alcohol. Yeo Woong informs Wang-joon his advertisers are dropping his endorsement deals, but she managed to buy some time to delay production for the drama. Wang-joon sees Da-da chatting with Young-gu outside, and decides to move out. With the reporters still surrounding Wang-joon’s residence, Diana invites him to her mansion and offers to work with him to pull Da-da and Young-gu apart, but he turns it down, claiming that Da-da will decide for her own. Wang-joon realizes he has been drugged by Diana and is taken away, and she proceeds to activate the newly-delivered Zero Ten , who has a striking resemblance as Wang-joon. (en)
- Having restored his memories, Young-gu decides to go back to Da-da. Bo-won is kicked out of the mansion and finds that Young-gu has escaped from Diana. Diana gets mad at Director Ko and In-hyuk that Ken/Young-gu had restored his previous girlfriend’s memories when he should have been reset. Young-gu takes Da-da home and orders a delivery feast for her. She promises that she will make him even happier. Bo-won looks for Young-gu just as he puts her to sleep, and after analysing him, he is amazed that Young-gu managed to restore his data on his own. He tells him that since the company knows that Young-gu had run away, Diana will go after him, and he will have to leave Da-da sooner or later. Da-da wakes up and embraces Young-gu. She accompanies him for stargazing, and recounts how lonely she is without him. Bo-won reports his findings to the Director, and together they seek a way to stop Diana. At Da-da’s house, Young-gu and Da-da are cornered by Diana, who has come back for him, and her bodyguards. She takes Da-da hostage. Young-gu sacrifices himself to save Da-da and agrees to go with Diana, but Da-da decides to buy Young-gu at the last minute, officially returning him to her side. It is later revealed that Bo-won and the Director had changed the contract so Da-da becomes Zero Nine’s legal owner, but it won’t be easy for the Director to convince the head office. Young-gu has not replied to Wang-joon’s messages when he took Diana as his girlfriend so he goes to the set personally to apologize to him. Wang-joon does not forgive him for hurting Da-da’s feelings, and he is no longer needed. Later, Young-gu lands himself in a stuntman position when the assistant PD needs one. (en)
- Young-gu wakes up in the lab to find himself shedding tears. Worried about Da-da, he escapes. As Da-da makes her leave, Bo-won and Director Ko are kicked out of the mansion again and they all learn about Young-gu's escape. Diana goes back on her word in giving In-hyuk the money, and mocks him for being debt-ridden. Da-da and Bo-won run back home to find Young-gu there, getting his feet dirty from running barefoot. He apologizes to her for falling sick. Bo-won explains to Young-gu that those weren't tears, but the immersion cooler in his brain that's leaking. He blames himself again for not anticipating that human emotions in a robot spell disaster, and decides to stay for the night. Da-da also blames herself for his meltdown and is scared she is going to forget her memories of him if he dies. She desperately begs him not to die. Bo-won looks back and is remorseful about telling Young-gu about love, but the latter replies he would have learned it eventually, and does not blame the both of them. In-hyuk returns to the company to learn he has been sacked over the interception of the heart-cooler. Bo-won learns from the Director that the manufacturer of the coolers has long died. He proceeds to look into the European model so as to find a successful alternative in cooling Young-gu, but is unable to. Young-gu prepares kimbap for breakfast, but the skin on his left hand burns. He tells Da-da he only has a month left to live, and that he has decided to go back to the lab to replace his skin tissue, but she couldn't bear to see him go. (en)
- Wang-joon drops by Da-da’s house to chat with her, and finds her with Young-gu. Unbeknownst to them, he isn’t really Wang-joon, but his lookalike. In-hyuk reminds Zero Ten/Wang-joon that he would be returned to the head office once his identity is found out. Da-da feels that Hwa-ni is faking his injuries to plot Wang-joon's downfall. Yeo Woong is puzzled to find Wang-joon behaving politely even to Mr. Geum, and wonders if he had been overwhelmed with shock. At the other end, the real Wang-joon is trapped inside Diana’s mansion and tries to make his way out of the room, but is blocked by Diana’s bodyguards and maids. Filming has been postponed yet again due to the reporters outside, but Wang-joon is raring to go, because he wants to invite Da-da out on a date. Young-gu notices that this Wang-joon is an impostor, and tries to apprehend him but is overpowered. Director Ko hacks into the emails and informs Bo-won when he learns Diana had used Wang-joon's likeness for Zero Ten. Wang-joon at the mansion sees an opportunity to text Young-gu his whereabouts before he is caught again. At the hospital, Da-da follows Geum and Hwa-ni behind their backs and learns that they are indeed putting on a show. The other Wang-joon takes Da-da out just as she is returning home, but he has ulterior motives. (en)
- As soon as Young-gu/Zero Nine appears, the Director recites an input code and knocks him unconscious. Wang-joon, who learns that Young-gu is living with Da-da, also goes to her house to find the Director and In-hyuk taking Young-gu away and accuses them of kidnapping. Da-da and Wang-joon threaten to call the police, but Bo-won manages to lure the two men out of the house. Bo-won, who confesses that he actually stole Young-gu from the company, proceeds to restore him, with Wang-joon unaware of their true nature. Young-gu asks Bo-won what a seven-year relationship means to humans. Wang-joon tries to tell Da-da that he was threatened to breakup with her. He takes Young-gu in for the time being. Young-gu learns more about Wang-joon while staying with him, concerned that he would be too busy to rest and be concerned about what really matters. Young-gu, concerned about Da-da, sneaks back home the next morning, and together they decorate the spare room he has been staying in. Da-da receives a flower box with break-up threats, and she finally learns the truth about the breakup. She rushes to Wang-joon’s residence, and finds him feverish. He passes out in front of her. (en)
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