The Roundup: No Way Out

Detective Ma Seok-do (Ma Dong-seok) joins the Metropolitan Investigation Unit after a promotion and is tasked with eradicating Japanese gangsters who enter Korea to commit crimes. His investigation leads him to a local nightclub where he uncovers a connection to a yakuza member named Hiroshi, who is supplying the potent drug "Hiper" from Incheon. Ma's team successfully apprehends Hiroshi but their victory is short-lived as a corrupt police captain orchestrates an ambush, stealing the confiscated drugs and killing Hiroshi to cover his tracks.