It was a normal day in school. The popular friends that went by the name Bangtan Sonyeondan were in one of the empty classrooms together with Jimin's little sister, Hyerin and her best friend, Sookyeon. They were playing video games. Everyone took turns playing on the playstation. Of course they were allowed to play in the classroom since it was lunch and the school had organized such activities once a week. However they all got startled when the hallways were filled with screams and loud footsteps. What had happened?