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 young man, whose only possession is a motorcycle, spends his time riding around the city looking for empty apartments. After finding one, he hangs out for a while, fixing himself something to eat, washing laundry or making small repairs in return. He always tries to leave before the owners get back but in one ostensibly empty mansion he meets the abused wife of a rich man and she escapes with him.
