An informant leads world-weary police detective Kim Hyung-min to small-time crook Kang Tae-oh, who says he murdered someone for hire 10 years ago. Before Kim can pursue the case, Kang is arrested for another crime, and he calls Kim from jail claiming he’s actually killed seven people. What follows is a psychological game of cat and mouse as the purported murderer tauntingly sends the agitated policeman on wild-goose chases after unreported cases. The film is inspired by true events, and riveting performances by Kim Yoon-seok and Ju Ji-hoon guide a fascinating police procedural that explores the dark side of human nature.