The film begins with high-level military leaders from both North Korea and South Korea discussing the surrender of a North Korean 50 Mt nuclear warhead () in a secret underground development bunker near the Korean Demilitarized Zone. The warhead was secretly jointly-designed, but international pressure has forced North and South Korea to hand over the device and close the facility. North Korean officer Major Kang Min-gil (Kim Seung-woo), displeased with the conciliation of the Koreas, steals the warhead with the help of several of his loyal soldiers. The leaders of both sides dispatch a South Korean special forces platoon under the leadership of Major Park Jung-woo (Hwang Jung-min).