Choi Hyeong-goo (Jung Jae-young) is a detective who was in charge of hunting down a serial killer who claimed the lives of 10 women from 1986 to 1990, and whom Choi suspects is responsible for the kidnapping and possible murder of another. He managed to hunt down the killer, but lost him after a fierce fight that left Choi nearly dead and permanently scarred. Before the killer vanished however, Choi managed to shoot him in the shoulder.