Ji A and Min Gyu confess how they feel about each other. Meanwhile, Ri El hears that Yoo Cheol will marry her.

Min Gyu ends up returning to the beach to see Ji A again. Meanwhile, he realizes Aji 3 kept a backup folder.

Ji A keeps coming to see Min Gyu. Meanwhile, Min Gyu finds out Ji A created the Heart Balls.

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 discovers all about what Ji A has done to him. From the shock, Min Gyu gets an allergic reaction.

Baek Gyeon decides to change Aji 3's face. He deletes every video except for the emotion patterns.

Baek Gyeon says Aji 3 will be ready in three days. Min Gyu goes on a date with Ri El and meets her dad.

Min Gyu calls Ji A for a delivery service, but she rejects it. Meanwhile, Ji A sees Min Gyu with Ri El.

Min Gyu tries to stop Ji A from going away, but Ji A tells him that she isn't Aji 3 but only a model for it.

Locked up in a storage room, Min Gyu tells Ji A about his story. She feels sad but decides to leave him.

Min Gyu becomes hopeful of curing his allergy. But Baek Gyeon is mad that Min Gyu and Ji A are getting closer.

Min Gyu sees Ji A on the train and follows her. Min Gyu almost finds out the truth about Ji A and Aji 3.

Ji A pursues her own dreams, while Min Gyu and Yoo Cheol become good partners in leading KM Financial.

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.

When Martin becomes impatient, Do Won promises that Aji 3 will be ready soon. Min Gyu tries to protect Aji 3.

Min Gyu tries to stop Do Won and bring Aji 3 back, but Aji 3 is nowhere to be found, making Martin furious.

Yoo Cheol learns about the cause of Min Gyu's allergy and decides what to do about the board meeting.

Ji A goes to Min Gyu's house. She makes her first mistake, but she must keep pretending she's a robot.

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 punches Min Gyu, brings Ji A home, and tells her she doesn't need to see Min Gyu anymore.

Ji A kisses Min Gyu first, which makes him feel confused and makes him keep a distance from her.

Baek Gyeon is shocked when Min Gyu says he likes Aji 3. Meanwhile, Dr. Oh tells Ji A about his allergy.

Min Gyu orders Aji 3 for trial. But that night, the research team accidentally spills beer on it.