Lee Byung-hun

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, Heesoo, 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 seemingly straightforward murder in the demilitarized zone between North and South Korea becomes a lot more complicated when the investigating Swiss/Swedish team discover the number of bullets found and fired don't add up in this crime thriller from Park Chan-wook (Oldboy).