As Minjae seeks love, an unexpected incident reunites him with Youjin, a stranger he met before.

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 finally start dating, but agree to keep their relationship a secret for now. However, their secret romance gets off to a rocky start when Sejin and Seohyun show up at Minjae's place all at once. With Minjae's first love, Seohyun, weighing on her mind, Youjin wants to make their relationship public and ends up telling Minjae's mother. But she shrinks under a series of pointed questions. From the very beginning of their relationship, the gap between Minjae and Youjin 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.