Ji-won is a young student who has lost her memory. Without any recollection of her former life friends or family she throws herself into her studies in order to start a new life. But soon Ji-wons past catches up with her as she starts suffering from sinister flashbacks. When three of her former friends are found dead all appearing as if they have drowned Ji-won realises that her past & the deaths are intricately connected. As she pieces together the fragments of her former life she soon discovers that if she wants to stay alive she must try to forget her buried past.