(Horror) Ji-won is a bright young student with amnesia.  She has no recollection of who she is, her friends or her life before the incident.  When  her old friends mysteriously start dying one by one, she begins to investigate. As she slowly begins to piece together fragments of her past, strange and terrifying visions start to haunt her. She discovers that she was once friends with three other girls, and together they formed an impenetrable alliance.