Young Min, the student with the worst grades in Ivy class is suggested to leave his glass booth and degrade into SKY class. Trembling with anxiety in feeling like he's being kicked out of a place he needs to be, Young Min locks himself inside of his glass booth. Everyone is under panic, trying to persuade him to come out. Right then, Bok Su shows up with a chair and runs up to break one of Sulsong High School's most symbolic system. (Source: Kocowa)