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 grows increasingly close to Professor Jihoon. He shares that he met Minjae in the US and gives her Minjae's new contact information. But Youjin brushes it off, insisting that their love is over. Meanwhile, Youseong happens to get in touch with Minjae and secretly investigates the couple's past without Youjin's knowledge. What could have happened between two people who were once so deeply in love?