Detective Jung-soo faces the victims of brutal murders who were killed for no reason and this makes him outraged. During the investigation, he meets Ji-hyun who is the only survivor and marries her, but they cannot escape from her tragic past. One day, Jung-soo's partner, So-young, arrives at the crime scene where she finds Jung-soo crying out in sorrow with his wife and daughter in his arms who are found viciously murdered after they went missing. But as the police and the law let the suspect go because for lack of evidence, Jung-soo decides to take vengeance himself on those unpunished killers and the cruel world.

아무 이유 없이 잔인하게 죽어 간 시체들을 마주하고 분노하는 강력반 형사 오정수. 사건 수사 중 만난 피해자 지현과 결혼하지만 두 사람은 참혹한 기억을 극복하지 못한다. 동료형사 소영은 묻지마 살인 사건 현장에서 참혹하게 죽은 아내와 딸을 안고 오열하는 정수를 발견 하는데…