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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.
Kim Min Gyu gets an allergic reaction when in contact with humans, but he says he isn't lonely.
Min Gyu orders Aji 3 for trial. But that night, the research team accidentally spills beer on it.
Ji A goes to Min Gyu's house. She makes her first mistake, but she must keep pretending she's a robot.
Min Gyu decides to keep Ji A. Meanwhile, Ji A discovers Min Gyu is the head of KM Financial.
Min Gyu believes Ji A is a robot and agrees to train her for a month, making Ji A face many obstacles.
Ji A discovers Min Gyu is her brother's boss. Meanwhile, Yoo Cheol hears about Santa Maria and Aji 3.
The cause of Min Gyu's allergy is told. Also, Ji A saves Min Gyu's life when he gets an allergic reaction.
Baek Gyeon wonders if it's okay for Ji A to stay with Min Gyu and realizes he still likes her.
Min Gyu becomes hopeful of curing his allergy. But Baek Gyeon is mad that Min Gyu and Ji A are getting closer.
Baek Gyeon punches Min Gyu, brings Ji A home, and tells her she doesn't need to see Min Gyu anymore.
When it is time for Ji A to leave, Min Gyu shows Baek Gyeon his allergic reaction to keep Ji A by his side.
Min Gyu learns how to kiss and tries to kiss Ri El on a date. Baek Gyeon follows them in secret.
Ji A kisses Min Gyu first, which makes him feel confused and makes him keep a distance from her.
When Baek Gyeon sees Min Gyu ordering Aji 3 to do household chores, he volunteers to do them himself.
Baek Gyeon says Aji 3 will be ready in three days. Min Gyu goes on a date with Ri El and meets her dad.
Baek Gyeon realizes why Ji A broke up with him. Meanwhile, Yoo Cheol shows up at the start-up competition.
Baek Gyeon is shocked when Min Gyu says he likes Aji 3. Meanwhile, Dr. Oh tells Ji A about his allergy.
Min Gyu tells Baek Gyeon how he always waits for Aji 3 to come, but he says Min Gyu is too lonely.
Ji A is sad about lying to Min Gyu. But Min Gyu has to reset her memory and misses her when she's gone.
Min Gyu calls Ji A for a delivery service, but she rejects it. Meanwhile, Ji A sees Min Gyu with Ri El.
