Bangkok Hell: Nor Chor - The Prisoners (2002)

Sinopsis

Ray's life is turned upside down when he is jailed for the accidental vehicular homicide. Life behind bars is bitter and violent. Over crowding, male rape, and drug abuse are the order of the day. The warden offers him a way out from this daily torment by working for him. He does his job well but he soon begins to realize that many of those incarcerated are innocent or victims of bad circumstances - but what can he do to help and how much danger is he placing himself in?