Series from 2014
If you beat up a good guy, it's violence. But if you beat up a bad guy, that is justice.
An undercover detective is murdered, and the chief of police summons Oh Gu-tak to investigate.
Tasked with catching the Northeast Serial Killer, the Bad Guys each begin their own investigations.
The Bad Guys launch a full-scale investigation to find a victim of organ trafficking.
The Bad Guys uncover the shocking truth behind an underground human trafficking organization.
The Bad Guys are tasked with catching a serial shooter who has killed 12 people.
Woong-chul is kidnapped and almost buried alive by Doo-gwang. The Bad Guys go to investigate.