Seung-uk Oh

Hae-shik and Hae-chul may be twin brothers, but that is pretty much where the similarities begin and end. Operating on opposite sides of the law, Hae-shik has a high-ranking position as a senior police officer while Hae-Chul falls in with a pretty tough crowd. When one of the brothers chooses to end his own life with his sibling's gun, a tense investigation involving shifting identities and questionable motives finds him traveling a dangerous road on which death may be the only escape. (rottentomatoes)

In order to capture a mob enforcer, homicide detective Jung befriends his girlfriend, Hye-kyung, only to fall in love with her. (imdb)

An ex-police officer embarks on a single-minded goal upon leaving jail, after serving a sentence for crimes committed under dubious circumstances.