Black Snake.

Tae-sik is a so-called "Hit Man" of a gang. But after his boss dies, the gang falls apart; and during a power struggle, Tae-sik's close gang member Gi-sun is murdered. Gi-sun was like a big brother to Tae-sik so he vows revenge. With the help of the dirty cop, Detectvie Han, Tae-sik is introduced to a woman named Mae-hwa. She provides clues for the murder and the two bond over their search for the killer. But during their search, Mae-hwa asks too many questions and it rubs the wrong people the wrong way that makes her end up being in danger; and now it is up to Tae-sik to rescue her.