Replaceable

Sun-ah, who returned to college after a year, visits a club for the professor's uncomfortable request.

The story of a lesbian, Jin-ah, who teaches a film production class at the local community center. During her first class, she meets her former high school teacher Seo-in and gets lost in old memories.

So-Jin, who is training for the physical fitness test for police recruitment, is being stalked by a man, but she cannot find a strong means of confronting the situation. Meanwhile, Hyeon-Sook, who lives in the same apartment complex of So-jin, cannot get away from her violent husband. They work out in a schoolyard for their own respective reasons.

Soon-ho works part-time at the Chinese restaurant and goes his first delivery. He fell in love with Yu-jin who came out of the door there. But Yu-jin gets to know that Soon-ho is gay.