Plot: Kim Sun-woo (Lee Byung-hun) is an enforcer and manager for a hotel owned by a cold, calculating crime boss, Kang (Kim Yeong-cheol), to whom he is unquestionably loyal. The two share concerns over business tensions with Baek Jr., a son from a rival family, which is when Kang assigns Sun-Woo what is perceived (at first) to be a simple errand while he is away on a business trip to shadow his young mistress, Heesoo (Shin Min-a), for fear that she may be cheating on him with another, much younger man, with the mandate that he must kill them both if he discovers their affair. As he performs his duty following Heesoo, and escorting her to a music recital one day he becomes quietly enthralled by the girl's beauty and innocence, as glimpses into his lonely, empty personal life become more prevalent.