The Policeman's Lineage

“Do you think you are right all the time?”

Min-jae (Choi Woo-shik), who is a policeman from generation to generation, has been ordered to investigate Kang-yoon (Cho Jin-woong) secretly, who is the ace team leader of the investigation team. Min-jae is appointed as the member of Kang-yoon’s team. Min-jae has the belief of “If the police do something illegal even if it has occurred during the process of investigation, he is also a criminal.” But while Min-jae investigates Kang-yoon, he begins to resemble Kang-yoon who has the belief of “The chase of crime should be justified even if it's illegal.” Will Min-jae be able to clear his private mission and arrest Kang-yoon that he trusts and admires?