Detective Jung-soo faces the victims of brutal murders who got killed for no reason which makes him outraged. During the investigation, he meets Ji-hyun who is the only survivor and marries her, but they cannot escape from the tragic past of Ji-hyun.

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 went missing. But as the police and the law let loose on the suspect because of a lack of evidence, he decides to take vengeance himself on those unpunished killers and the cruel world.