In the late Joseon dynasty, counterfeits were circulating around. Detective Ahn of Left Security Station and a passionate newcomer, Nam Sun, try to trace the source of the counterfeiting. They chase the Secretary of National Security and his man 'Sad Eye' as suspects. A predestined battle between the best woman detective in Joseon, Nam Sun, and a mysterious assassin 'Sad Eye' is unfolded. A magnificent, chivalric film that showcases Lee's style.