No Tears for the Dead(우는 남자)

Gon, a Korean hitman bred in the United States where he works for a Chinese triad, usually flawless in taking out his targets, makes a terrible mistake in fulfilling a mission. Swamped by feelings of regret, Gon no longer wants to be a hitman, but, in order to tie up loose ends, his boss forces him to do another job in Korea.