Vigilante

In the past, Kim Ji-Yung's mother was brutally beaten to death by a thug, who was sentenced to only 3.5 years in prison. Now grown up, Kim Ji-Yung sees that his mother's killer has not changed at all. During the weekdays, he is an exemplary student at the police university, but on weekends, he takes the law into his own hands, punishing criminals who have received lenient sentences and continue to commit crimes.