What follows is a relentless, bloody descent into the city's underworld as he uses his lethal skills as a former special agent to track her down. The film masterfully balances its intense, hard-R violence—culminating in one of the most famous knife-fight scenes in modern cinema—with a genuinely moving, emotional core of redemption and sacrifice.

In the aftermath of the violence, Tae-sik finds So-mi. The adrenaline fades, and the stoic man finally breaks down, weeping as he holds her safe. The police arrive, and Tae-sik surrenders peacefully, accepting his fate.

The film is renowned for its hyper-realistic, brutal close-quarters combat. The final knife fight sequence utilizes Southeast Asian martial arts like Silat and Kali, setting a new standard for action choreography that influenced future Western films like John Wick .