He is a police. He is one with a past. One without a future. He tries to reveal the dark secrets of his life. The ones he had forgotten. All he knows, is that he is born by a criminal. That he is born by his enemy. As an odd, special young woman named Kim Yoo Jung joins the team, them, along with Park Bo Gum finds themselves surrounded by a serial murder case, all done by the same person: Bo Gum's father.