20-year-old Jeong-hee doesn't go to college and works part-time. She goes to meet Min-young, her old high school roommate, for the first time in a while and wants to play with her as before. However, Min-young, a college student, is busy sending correction emails for her credits and feels uncomfortable by Jeong-hee's visit.
Shortly before the start of music class, where the teacher forces the students to sing as a punishment, Hansel, a high school student, realizes that she has forgotten to bring her recorder. For Hansel, the idea of singing in front of her classmates is worse than death, so she rushes home to get her recorder.
