Youjin wants to go to grad school and asks Minjae for help. Will she make it into the robotics lab?

Feeling out of place on her first day, Youjin clashes with Sejin and finally snaps at Minjae.

As rumors spread that Minjae was seen with a mysterious woman, a jealous Youjin makes a bold move.

On a rainy night, Minjae can no longer ignore Youjin's bold feelings or his own.

Minjae and Youjin start a secret romance. From day one, the gap between them only grows.

Minjae and Youjin help Sejin pursue Subin. Youjin's test of love triggers Minjae's old insecurities.

Minjae defies Youseong. Sejin discovers their secret and challenges Youjin to a risky bet.

Youjin dismisses Minjae as a love left behind. What drove them apart?

Jihoon reveals his feelings for Youjin. At a welcome party, she runs into Minjae, now a professor.

As Minjae struggles with his lingering feelings for Youjin, she suddenly appears before him.

Now it is Minjae's turn to make a move. But the two must once again face their most dreaded choice.