To combat rising violent crimes, the Police Chief asks Detective Oh Goo Tak to form a team consisting of criminals. He is currently suspended from the police force for using excessive force. He then gathers team members: Park Woong Chul who is a gangster, Lee Jung Moon who is the youngest serial killer with extraordinary intelligence and Jung Tae Soo who is a contract killer. Police Inspector Yoo Mi Young also joins the team and she tries to have these guys work as a team by dealing with them rationally and sometimes emotionally.
When Nam Gun Wook has been stabbed to death, His father, Nam Goo Hyun reinstates Oh Goo Tak to fight crime with criminals. Yoo Mi Young is worried about the men selected for this job.
The team of mad dogs are tasked to find a blood obsessed serial killer before he manages to kill someone else.
After a failed attempt of the police to dismantle a black market of organs, the team of mad dogs is now tasked to continue and dismantle the organization before someone else is being killed.
The team of mad dogs are now hunting for the leader of the black market for organs. However by arresting her, it seems like an impossible task to get out alive.
Someone is killing six people randomly in several shootings, however something is odd about that latest shot. What's the motive behind it? Is the team able to identify the shooter in order to arrest him?
Doo Gwang orders his gang to bury Park Woong Chul alive as he declined several times to kill Lee Jung Moon. When his gang is busy burying him, Doo Gwang is betrayed and kidnapped by someone from his own gang.
When Hyun Woo and Im Jong Dae are killed, Jung Tae Soo promises Hyon Woo's fiance he would do everything to find his killer. His search however brings him some nasty encounters.
Lee Jung Moon is investigating his own past to know more about himself and those murders. Yoo Mi Young sides with prosecutor Oh Jae Won and discovers a disturbing factor in their team.
When Yoo Mi Young confronts Oh Goo Tak with the plot he planned, she asks for his reasons to do so and why them?
Prosecutor Oh Jae Won plan is now in motion as he angers Tae Soo & Woong Chul by revealing a story. Oh Goo Tak is hunting Lee Jung Moon.
When Nam Goo Hyun is killed, Mad dog team is framed for the murder. To prove their innocence, they come up with a plan to reveal the truth behind many murders.
Harboring a traumatic experience that led to him to avoid crime scenes, prosecutor Noh Jin Pyung begins his first day of work in the city of Seowon.
While tracking down their immediate suspect, Je Moon's men find an unexpected link between Jo Young Guk, their ultimate target, and the city's mayor.
To find proof that Jo Young Guk committed bribery, Je Moon hatches out a plan that'll make it easier to locate where his dirty money is stored.
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Jin Pyung, who's full of doubts after a secret meeting with deputy chief prosecutor Ban Joon Hyuk, is tasked with interrogating a key witness.
Despite the chief prosecutor's instructions, Je Moon orders a stop to the search and seizure, and tries to pursue a new route to catch the bad guys.
When his team suffers casaulties, Je Moon no longer has room for mercy and calls for Jo Young Guk's arrest -- no matter what it may cost.
The day of the final hearing arrives, and Je Moon prepares to conclude Jo Young Gook's case, but an even worse enemy threatens to thwart his plan.
Hoping to find answers regarding his late colleague's case, Jin Pyung accepts Ban Joon Hyuk's offer and joins a special investigations team.
To pay his sister's hospital bills, Gang Joo has no choice but to get help from a loan shark, who offers to cancel the debt in exchange for a ''service''.
Heo Il Hoo searches for the missing high school. Je Moon secretly investigates the cases that Special Team Three supposedly solved already.
Soon after Lee Myung Deuk warns him to disband Special Team Three, Ban Joon Hyuk receives news that there's a problem within the team.
Je Moon and his reunited team of men find out that the evidence regarding the Inbuk teen murder case may have been fabricated.
Detective Hwang from Special Team Three is in crunch time to catch the wanted men. Likewise, Je Moon's men prepare to take on their adversaries.
Not happy with how things turned out for Jo Young Guk, Je Moon tries to get Ha Sang Mo's testimony himself, but a shocking truth awaits.
Je Moon quickly closes in on Jo Young Guk. Meanwhile, Mayor Bae Sang Do's sister plans to do whatever she can to get her brother re-elected.
Mayor Bae's niece devises a foolproof political scheme for her uncle. Je Moon vows to get revenge -- for his comrades, and for all the people of Seowon.