A Bittersweet Life is a 2005 South Korean neo-noir action drama film written and directed by Kim Jee-woon. It stars Lee Byung-hun as Sun-woo, a hitman who becomes targeted by his boss after he spares the latter's cheating mistress.

Kim Jee-woon is a South Korean film director, screenwriter, and producer. He was a theater actor and director before debuting with his self-written and directed film, The Quiet Family in 1998. Kim has worked with increasing levels of success in cinema, showing accomplished acting and a detailed stylization in his films. He is currently one of the most recognized screenwriters/directors in the Korean film industry.