Six years ago a mysterious shooting occurs in Seoul. The after results of the shooting results in Han-kyu Lee (Song Kang-Ho) shedding his work at the NIS (National Knowledge Solution). 6 years later, Ji-won Song (Kang Dong-Won), an ex lover North Oriental spy. Now runs somewhere in the Seoul city. As these 2 guys conceal their identifications and function their specific angles, trouble brews once more ...