Plot: Kim Sun-woo is an enforcer and manager for a hotel owned by a cold, calculative crime boss, who assigns him to a simple errand while he is away on a business trip. Sun-Woo is to shadow his boss's young mistress, Heesoo, whom he fears may be cheating on him with another, younger man. Sun-Woo is mandated to kill them both if he discovers their affair, but he decides to spare their life at his own expense.
Alternative Plot: A gangster (Lee Byung-hun) starts a violent feud after he refuses to kill his boss's (Kim Yeong-cheol) cheating girlfriend.
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