You're a Girl In Gaeul's class, there is an invisible caste system. you who are quiet enter group 3. one night you go to school to pick up your jacket that you left behind in class, but when you enter the classroom at night, you see Yuhyeon with a pale face looking at the window outside, you want to call him but have fear so go straight in then look at the window seen by Yuhyeon and you see eunsul's body outside the dark school lying on the ground and yuhyeon looks straight at you in silence.