Oh Yeon-soo

An army prosecutor with ambitions for fortune and power finds his plans derailed by an unwelcoming newcomer who joins the force with her own objectives.

Three years after a secret agent's tragic death at the hands of terrorist group IRIS, team leader Joon-han recruits a detective, Yoo-gun, to help him bring down an illegal arms unit. Soon, Yoo-gun's working alongside agent Soo-yeon, a man who has loved her since youth. Together, they put their lives on the line to stop IRIS once and for all.