Min-jae that is a cop from generation to generation has been purchased to examine Kang-yoon covertly, who is the ace team leader of investigation group. Min-jae is selected as the member of Kang-yoon's group. Min-jae has idea of "If the police do something unlawful also it has actually been occurred during the process of investigation, he is additionally a criminal." However while Min-jae checks out Kang-yoon, he begins to appear like Kang-yoon who has belief of "The chase of crime ought to be justified even it's unlawful." Will Min-jae be able to clear his exclusive goal and also apprehension Kang-yoon that he trust funds and also appreciates?