Detective Ma Suk-Do (Ma Dong-Seok) joins a new crime investigation unit led by Jang Tae-Soo (Lee Beom-Soo) and includes Detective Kim Man-Jae (Kim Min-Jae). They go up against Joo Sung-Cheol (Lee Joon-Hyuk), who is the son of a powerful chaebol family. The Japanese yakuza are also involved in the case.