A drifter lives in people's houses while they are away and repays them by doing chores for them. His life changes when he meets a beautiful woman who wants to escape her unhappy marriage.

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.