Same Age Younger Sister

Scene 1. A man and a woman who were childhood friends suddenly become step-siblings after their parents get married. One day after breaking up with her boyfriend, the woman complains to her friend-turned-stepbrother while they drink together, and they come to realize their feelings for each other.

Scene 2. A woman, who is a five-time college entrance exam retaker, receives private tutoring from an older guy from the neighborhood. Feeling bored and restless, she starts wearing provocative clothes to seduce her tutor.