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.

Dan-kyung, a mediocre art academy instructor, dreams of becoming a successful comic artist like her talented sister, Ju-kyung. However, opportunities never seem to come her way.