Yoon Soon-yong

Navigating both the criminal underworld and law enforcement agencies, professional snitches called "yadang" provide covert information about the drug world to prosecutors and police. When a drug bust at a party attended by high-profile second-generation VIPs entangles those involved into a dangerous conspiracy, a seasoned yadang must do everything in his power not just to make it out on top, but alive.

Two police stations from neighboring precincts are in constant fierce competition with each other, including for the Officer of the Year award. But then a high-profile case forces them to work together.