A desperate father who tries to save his daughter and a man who tries to save his wife. In their desperate efforts to save their beloved, the day repeats in endless loop, and two men realizes that there’s third man who keeps murdering their beloved out of vengeance.

Abandoned by his mother shortly after immigrating to America, Gon is raised by the mafia and grows up to become a cold-blooded hitman. Though usually flawless in taking out his targets, Gon makes a terrible mistake of killing an innocent young girl. Swamped by feelings of regret, guilt and shame, Gon no longer wants to be a hitman, but his boss gives him one last mission. So Gon finds himself in Korea, the land of the mother that abandoned him, on the trail of his last target. But in bitter irony, that target is Mo-gyeong, the mother of the dead child.

Jung-gu sends out homemade bombs to people who are likely to use them. He partners up with Hyo-min, the first person to actually detonate one of them. However, Hyo-min becomes reckless and stirs up Jung-gu’s aggressive tendencies that he has tried hard to suppress. Finally, Jung-gu explodes in anger, killing the detective on his tail and framing Hyo-min for all his crimes.