Zhao Zhipeng, the leader of the famous gang organization "Ran Yue" in City D, was secretly arrested, but was assassinated while awaiting trial. The superiors put pressure on the police to deal with it in a low-key manner. Unwilling to do so, the young police officer Cheng Rui decided to investigate on his own. As layers of fog gradually emerged, he discovered that things were far from as simple as he imagined...