Jeong-beom Lee

Abandoned by his mother shortly after immigrating to America, Gon is raised by the mafia and grows up to become a cold-blooded hit-man. Though usually flawless in taking out his targets, Gon makes a terrible mistake of killing an innocent young girl. A flood of guilt takes over his life and the situation becomes worse when his boss assigns him the job of killing the young girl's mother. Gon's new target, Mogyeong, is a risk manager at an investment firm and has buried herself in work to bury her grief. She is completely unaware of her role at the heart of a dangerous conspiracy. Finally, she meets the man who wants to tell her the truth behind the death of her child.

An ex-special agent CHA Tae-shik's only connection to the rest of the world is a little girl, So-mi, who lives nearby. Her mother, Hyo-jeong smuggles drugs from a drug trafficking organization and entrusts Tae-shik with the product, without letting him know. The traffickers find out about her smuggling and kidnap both Hyo-jeong and So-mi. The gang promises to release them if Tae-shik makes a delivery for them, however it actually is a larger plot to eliminate a rival drug ring leader. When Hyo-jeon's disemboweled body is discovered, Tae-shik realizes that So-mi's life may also be in danger. Tae-shik becomes enraged at the prospect that So-mi may already be dead and prepares for a battle, putting his own life at risk.