A Bittersweet Life (; lit. "The Sweet Life") is a 2005 South Korean neo-noir action film written and directed by Kim Jee-woon. It stars Lee Byung-hun as Sun-woo, a hitman who is ordered by his boss Kang to keep an eye on his mistress Hee-soo. A violent encounter with her lover brings Sun-woo to a realization that he must not kill him and this is where the trouble begins; seeing Sun-woo refusing to comply with his orders, Kang decides to get him killed despite his longtime loyalty. However, Sun-woo violently escapes execution and sets out to exact revenge upon Kang and his henchmen.