Rough Cut (2008)

Su-ta is an arrogant star who is constantly getting into fights. Gang-pae is a cool, menacing young gangster who conceals a lifelong wish to become an actor. When Su-ta injures his co-star on the set of his new film, Gang-pae ends up taking the now-vacant role. Gang-pae agrees with the condition that the violence portrayed in the movie has to be real and not fake acting violence. Su-ta accepts the condition and they get ready for the real match.