A woman works as a special makeup artist. Because her heart was broken in the past, she finds it hard to love again and has a cold heart full of sadness. She unexpectedly falls in love with a humanoid robot programmed to be the perfect boyfriend and all the while a top star is competing for her affections as well.
It’s the last day of Zero Nine’s trial period. Bo Won comes to Da Da’s place to take Zero Nine. As they leave, Zero Nine finds a location tracker in Bo Won’s car. Bo Won and Zero Nine split up to run away, but Bo Won gets into an accident. Meanwhile, Da Da sees Wang Joon doing an interview at the TV station.
Bo Won tells Ji Seok about Zero Nine having real feelings, but Ji Seok doesn’t believe him. In Hyuk tries to bring Zero Nine back but fails. Wang Joon tells Da Da to come back to him and proposes to her. Meanwhile, In Hyuk takes Diana to Da Da’s place to see Zero Nine.
Wang Joon asks Da Da to give him a chance to get her back. Diana tells Zero Nine about her hand and the accident. Zero Nine shows an error again, and Diana plans to take him to the head office to examine him. Bo Won finds out about her plan and asks Da Da to stop them from leaving.
Da Da still has no idea about Young Gu’s condition but after talking to Wang Joon, Da Da slowly comes to know about Young Gu’s condition. Meanwhile, Diana visits Young Gu before going back to New York, and asks him about his condition while apologizing for what she has done.
Da Da becomes the CEO of her company, and Woong and Bo Won is married. Wang Joon successfully finishes his drama and gets a chance to work abroad. He asks Da Da to go with him. Meanwhile, Bo Won takes Da Da to Kronos Heaven to see Young Gu for the last time.
Da Da gets a day off as Wang Joon’s shoot gets delayed. Da Da and Zero Nine clean the workroom together. Kyu Ri comes to Da Da’s place with outfits, and Zero Nine hides in the bathroom. Meanwhile, Wang Joon spends a day alone and looks back on his memories with Da Da. He goes to see Da Da and sees Zero Nine at her place.
Da Da tells Zero Nine not to shut down the system, and they return home together. Ji Seok and In Hyuk meet Diana and tell her that they need a week more to deliver Zero Nine to her. Da Da and Zero Nine go to an amusement park for part-time jobs, and Wang Joon appears for an event.
Manager Ko Ji Seok calls Bo Won and tells him that they only have a week before Diana finds out about Zero Nine. Zero Nine asks Da Da to name him, and Da Da calls him Young Gu. Young Gu looks through Da Da’s place and cleans up the place. While cleaning up, he throws away Da Da’s precious things by mistake.
Bo Won asks Wang Joon to keep Young Gu’s identity a secret. Meanwhile, Diana comes to see Wang Joon. She invites him to her place and makes an offer regarding Da Da and Young Gu.
Diana kisses Zero Nine, and he gets reset. He loses all his memories including the ones he shared with Da Da. Diana takes Zero Nine to her house and gives him a new name. Flustered, Da Da seeks for ways to get Zero Nine back. Meanwhile, Wang Joon sees Zero Nine with Diana.
Kyu Ri tries to bring Da Da and Wang Joon back together and says harsh words to Young Gu. Wang Joon sees Da Da and Young Gu having a joyful time together. He tells Young Gu that he will give up on Da Da. Meanwhile, Manager Ko panics as he receives the data analysis of Young Gu.
Da Da gets replaced and works for Hwa Ni, a junior actor who is a rising star. Hwa Ni makes a scene, and Zero Nine appears and rescues her. Wang Joon sees Zero Nine and Da Da together, and he wants to know about their relationship. Meanwhile, Diana hurries Jung Hwan to bring Zero Nine to her.
Wang Joon and Da Da run into each other at the amusement park. Da Da leaves with Zero Nine, and Wang Joon gets upset as he sees them together. Da Da and Zero Nine get closer as they spend the evening at the amusement park. Meanwhile, Woong finds out about Wang Joon’s secret.
Da Da kisses Zero Nine by mistake, and Zero Nine regards Da Da as his girlfriend. Da Da and Zero Nine get into a car accident, and Wang Joon tells Woong about his breakup. Meanwhile, Bo Won finds Zero Nine with Da Da. He tries to take him, but Zero Nine wants to stay with Da Da.
Wang Joon tells the director that he will join the show if Da Da’s team works with them. He wants to work with Da Da to get her back. Da Da and Zero Nine go shopping together, and Zero Nine learns about human traits. Meanwhile, Woong gets involved in a car accident.
Diana goes to Kronos Heaven and demands to see Zero Nine. Ji Seok manages to soothe her and gives her the tablet PC with details regarding Zero Nine. Woong needs to take a break for a month because of the accident. Meanwhile, Zero Nine finds out that Da Da is working with Wang Joon again.
Wang Joon wins the Best Male Lead Award. Da Da watches the show as she waits for him at his house. She is excited to see him win the award but also feels sad because she can’t congratulate him openly. Instead, she gets into an embarrassing trouble. Meanwhile, Bo Won finds out about the client who will take Zero Nine.
Wang Joon is suspicious of Young Gu’s identity. He looks for clues at Da Da’s place and finds out about Young Gu and Kronos Heaven. Da Da tells Wang Joon to understand her and keep Young Gu’s identity a secret. Meanwhile, Hwa Ni makes a scene at Wang Joon’s dressing room, and Eun Dong makes it into a scandal.
Wang Joon is locked up by Diana, and Zero Ten who looks like Wang Joon appears at Da Da’s place. Zero Ten pretends to be Wang Joon, but Young Gu notices his true identity. Ji Seok also finds out about Zero Ten, and Wang Joon takes tact and calls for help. Meanwhile, Zero Ten takes Da Da out to talk.
Da Da tells Wang Joon that Zero Nine is her new boyfriend. Wang Joon gets jealous and makes unreasonable complaints about her makeup. Meanwhile, Da Da forgets to bring a dummy to the scene, and she asks Zero Nine to bring it in time. Zero Nine brings the dummy on time, but he gets hurt on his way.
Wang Joon is the lead in a drama, and Da Da and her team work on the show as the special effects makeup team. They don’t seem to get along at the set but in fact, Wang Joon and Da Da have been lovers for seven years in secret. Meanwhile, a humanoid called Zero Nine is getting ready for the final test.
Young Gu’s condition gets worse, and he only has a few days left. Da Da and Young Gu go out for their last date to make happy memories. On the way home, Young Gu finally stops. Three years later, many things changed for Da Da and her friends. But she still misses Young Gu from time to time.
Young Gu collapses because of the meltdown. He is overloaded as he learned human emotions with Da Da. Bo Won and Manager Ko try to find a way to save Young Gu. Diana seeks for revenge as she hears about Young Gu’s meltdown. Da Da is upset because there is nothing she can do for Young Gu.
Zero Nine and Da Da spend the day together, but they hear people talking about Wang Joon’s accident. Zero Nine and Wang Joon run into each other as they both investigate to find the real culprit. Da Da goes to a middle school for a part-time job. Meanwhile, Wang Joon witnesses something suspicious about Zero Nine.
People find out about Young Gu’s identity. They are against Da Da and Young Gu’s relationship for various reasons. However, the situation makes their love deeper. In Hyuk finds out about Young Gu’s possible meltdown. Eun Dong comes to apologize, and Woong shows her feelings towards Bo Won.
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