Seong-jin, a homicide detective with simple dream, finds himself getting entangled in an insidious scheme of the NSA Director Gyu-nam after delving into an investigation of a suspect named Tae-sung who might be the first serial killer of modern Korean history. Seong-jin accepts Gyu-nam's dangerous offer under a condition that Gyu-nam helps his son get a leg surgery. In a turbulent era of military.
