In 2004 Seoul, Jang Chen, a ruthless gangster from Harbin, seizes control of the city’s underworld with his merciless crew. His violent rise plunges the district into chaos. Detective Ma Seok-do (played by Don LEE), known for his iron fists and relentless drive, refuses to back down. With his scrappy team of detectives, Ma sets out to stop Jang’s reign of terror and restore order to the streets—no matter the cost.