"The K2" is a story of revenge by a former special forces soldier who gets involved in a dangerous political game. Several years ago, Kim Jae Ha was a mercenary soldier, performing dangerous missions for the country. However, after being betrayed by close comrades, the young man is forced to hide from his superiors abroad. An unexpected opportunity allows him to return to his homeland, where he becomes a bodyguard for a presidential candidate, his ambitious wife, and their secret daughter.