Kim Sun-woo is an enforcer and manager for a hotel owned by a cold, calculative crime boss, Kang who assigns Sun-woo to a simple errand while he is away on a business trip; to shadow his young mistress, Hee-soo, for fear that she may be cheating on him with a younger man with the mandate that he must kill them both if he discovers their affair.
A Bittersweet Life is a 2005 South Korean action 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.
