Kang Ki-Beom (Choi Jin-Hyuk) is an elite detective. He is currently investigating the criminal organization Argos, but, when he comes home, he finds several men in masks. His wife is murdered by the masked men sent from Argos. They beat Kang Ki-Beom and cut out both of his eyeballs. When Kang Ki-Beom wakes up, he finds himself in the hospital and he is accused of murder. The NIS then approaches Kang Ki-Beom. He is selected to become a member of Rugal, a special team organized by the NIS. Through biotechnology, he gains two artificial eyeballs with a special ability. Kang Ki-Beom and the Rugal team set out to take down criminal organizations.