Kim Min Gyu has wealth and success, but lives an isolated life due to his allergy of people. He then meets and falls in love with a girl who is pretending to be a robot for her ex-boyfriend, a genius robots professor.
Episode 1
Kim Min Kyu is a wealthy playboy with a mysterious illness: he can't come into physical contact with other humans. His life changes when he learns about Aji 3, a convincingly lifelike robot. Min Kyu examines Aji 3 and learns of her many features. Jo Jin Bae learns more about his boss. Meanwhile Ji Ah perfects one of her inventions.
Episode 2
Jo Ji Ah must pass Kim Min Kyu's inspection, but her connection to Aji 3 cuts out at the worst possible moment. Kim Min Kyu investigates the shady goings-ons of his own company. Jo Ji Ah's invention qualifies for the finals of a competition.
Episode 3
"Aji 3" earns points to climb the rankings of Min Kyu's house. Min Kyu takes his robot along for an important business meeting
Episode 4
Will a deep dive into Min Kyu's tragic past reveal the nature of his bizarre condition? The necklace safely arrives, along with a few figures from Min Kyu's past.
Episode 5
Min Kyu responds to the proposal in an usual way. Feeling good about his allergy going away, Min Kyu looks forward to spending more time with "Aji 3."
Episode 6
The Santa Maria robotics crew attempts to find a new investor. Jo Ji Ah calls in a "kiss tutor" to make sure things go smoothly in the house.
Episode 7
Min Kyu is deeply tormented after being kissed by his robot. Everyone in the house feels extremely awkward.
Episode 8
Ji Ah is confused when Min Kyu suddenly treats her with indifference rather than his usual warmth. Unbeknownst to her, Min Kyu struggles with his developing feelings for his robot. Do Won tries to get Jin Bae on his side. While having dinner with Ji A, Baek Gyoon finally understands why she broke up with him. On the day of the final screening for start-up items, Yoo Cheol suddenly decides to participate in the event.
Episode 9
The final round of the business idea contest is finally upon Ji Ah. Will Min Kyu see through her paltry disguise? Ji Ah believes her chances at love are forever ruined after making a big discovery.
Episode 10
Ji Ah spends one final day with Min Kyu as Aji-3. Min Kyu enjoys his new life, but finds his position at work in peril.
Episode 11
After a chance encounter on the train, Ji Ah maintains the charade. Meanwhile, Min Kyu's enemies close in on the Santa Maria team. Ji Ah entertains her unwelcome guest to the best of her ability.
Episode 12
Ji Ah and Min Kyu get locked in the boathouse. Meanwhile, Pi and Doctor Hong try to fix the van. At the lab Sun Hye, Ssanip, and Hoktal discuss Min Kyu. The Professor finally catches up to Min Kyu, unaware that Aji 3 was hacked.
Episode 13
Kim Min Kyu's human allergy comes raging back after he learns the truth. Will he survive with his position intact? Min Kyu wakes up from his coma furious with the world. Can anything save his love for Ji Ah?
Episode 14
Kim Min Kyu and Jo Ji Ah meet, him having finally decided to listen to her explain. Meanwhile, Hoktal and Ssanip once again vie for Sun Hye's attention at the Summer Snow Cafe. Doctor Hong and Jo Jin Bae try looking for Jang Doo Sam. The American puppet master emerges from the shadows to claim Aji 3 as his.
Episode 15
After the Santa Maria team spends a great night together, Madam X makes another appearance. KM financial decide to expel Kim min-kyu. Will there be anyone who will stop them?
Episode 16
In the second-to-last episode, Kim Min Kyu takes his future into his own hands. Will Kim Min Kyu and Jo Ji Ah find their happy ever after in the series finale?
