In-su returns to his hometown where he started to see ghosts. He tried running away, but more and more ghosts swarm around him. Meanwhile, In-su’s new high school life is a nightmare and his only consolation in a mysterious ghost girl. One day, In-Su’s classmates get attacked one by one a gruesome-looking masked girl. In-su senses powerfully fierce grudge around the class and engages deeper into the deadly case to unmask the secret.