Choi Pil-jae is a disgraced ex-cop who works as a "broker" between criminals and his lawyer boss. Choi plans to one day take revenge on his treacherous ex-partner Yang who destroyed his police career. He gets his opportunity when he's contacted by an innocent man convicted of murder in a high-profile case, courtesy of sloppy police work from Yang. Choi decides to prove the man innocent and ruin Yang. But as Choi investigates, he realizes that much more powerful and dangerous forces are the ones truly responsible for the murder and the cover-up.