Ji-yeon is a 17 year old girl, who was arrested for assaulting and bullying other students in her old school. She spent some time in juvenile prison, due to assumed and association with missing/dead people at her school, and accused of serial murder. She was freed when no solid evidence was found. Now she's at your school as the new student. There have been more missing cases around, but only assumptions point to the girl. But this time... it could be someone else.