The film revolves around a mute hitman who vows to kill only rude people, and use the money for his tongue operation.

A lonely chef with a speech impediment takes a job as a professional killer in order to raise the money he needs for an operation on his tongue.

Known as "Killar" (Shin Ha-kyun), he and his partner "Ballet" (Kim Min-jun), make a rule to only kill rude and impolite people.

After killing each one of his victims, "Killar" goes to the same bar where he meets "Her" (Yoon Ji-hye), a woman who becomes attracted to him.

No Mercy for the Rude was released in South Korea on 24 August 2006,[2] and on its opening weekend was ranked second at the box office with 269,308 admissions.