Detective Ma Seok-do changes his affiliation from the Geumcheon Police Station to the Metropolitan Investigation Team, in order to eradicate Japanese gangsters who enter Korea to commit heinous crimes.

The ‘Beast Cop’ Ma Seok-do heads to a foreign country to extradite a suspect, but soon after his arrival, he discovers additional murder cases and hears about a vicious killer who has been committing crimes against tourists for several years.

By an encounter with a wiry female lawyer So-hyun at the redevelopment protest site, a cold mobster JANG Se-chool decides to be ‘a good person’ as she advised. One day accidentally he saves people from a bus crash, becomes a hero of the city at a bound and it even leads him to run for the National Assembly. But his luckiest chance to be ‘a real good person’ is yet to come until the rival candidate Choi conspires with Se-chool’s enemy clan boss Gwang-chul.