In 1999, a robber breaks into a supermarket in small town, killing an elderly woman and running away. The police identify three boys as the culprits and quickly close the investigation. Soon after, Hwang Jun Cheol, who is newly appointed as the chief of the squad, is convinced that Choi Woo Sung, a high-ranking police officer, and his team manipulated the case for a quick result. Hwang attempts a reinvestigation and retrial with his unique persistent and robust investigation capacity.(Source: BIFF)