Revealing the Mysteries of High School (novel)

Pran, who forgot everything about Prae-his girlfriend. If someone try to go to class 12 1/6 something bad happens to them, they will be tortured and the unsolved death will disappear. Many students have tried to risk their life, but none of them haven't tried to escape their death. Their principal is involved in all and has an affair with a student in room 12 1/6, and being used to be the spy of the class. The remaining student was afraid but the friends bravely face the all difficulties-just to solve the mystery.