Shin Hyun (Cho Seung-woo) walks into the local police station toting the mutilated bodies of six missing women, confesses to the murders and accepts his fate. A psychopathic serial killer is caught and the case closed. Or is it? One year later, the bodies of two high school girls and a pregnant woman are discovered, killed in the same manner. Believed to be a copy-cat crime, detectives Kim Mi Yun (Yeom Jung-ah from A Tale of Two Sisters) and Kang Tae Hyun (Ji Jin-hee), polar opposites both professionally and personally, are assigned to the case. As the investigation continues, new suspects are taken into custody, but the body count continues to rise. It soon seems that no one, not even the detectives themselves, are beyond suspicion.