A North Korean agent, wrongly framed for the murder of his wife and child, flees to South Korea seeking revenge against the individuals responsible for his personal tragedy. Stripped of his identity and branded a defector, he survives by working as a driver for a wealthy CEO while secretly hunting for clues. During this period, he stumbles upon evidence that could expose a major conspiracy involving both North and South Korean intelligence agencies.

As he delves deeper into the murky world of espionage, he becomes entangled with various operatives, including a determined South Korean intelligence officer and a skilled mercenary. Navigating through betrayals and shifting alliances, he gathers information that narrows down the mastermind behind his family's demise. Caught in a deadly game of cat and mouse, his quest for vengeance leads him to uncover truths that defy his expectations and thrust him into a moral quandary, forcing him to confront the cost of his pursuit.