Synopsis：The border region of Country K is fraught with complex forces and constant conflict. During a mission, Police Officer Song Shao's comrade is gravely wounded and left unconscious while saving him. Song Shao's wife is also killed as collateral damage from an organization's task. To protect his only daughter, Song Shao chooses to retire and live under a false identity, while secretly tracking down his enemies for revenge. Finally, in a kidnapping case that involves his daughter, the enemy's whereabouts are revealed, setting the stage for a bloody confrontation...