Seven years after the roundup in Vietnam, Ma Seok-do joins a new squad to investigate a murder case. He soon starts to dig deeper when he finds out the case involves a synthetic drug and a gang of thugs.

Walter Vetrivel is an honest police office, who delivers justice even if it is against his family. He refuses to spare his criminal brother when he discovers that he is involved in malpractices.

A corrupt police officer finds his life changing when he takes on a case of gang rape.