The story is set in the late Qing Dynasty and early Republic of China. It tells the story of a sensational murder and robbery in a small town in Hubei. The escort Qin Gang died strangely and tragically, and the town detective Deng Long was appointed to investigate. Soon after Deng Long and his assistant Song Feiyan inspected the scene, they locked the suspect as a man named Chen Tianhe. The arrested Chen Tianhe confessed to the case and directly admitted that he was the one who committed the murder. This made Deng Long suspicious, and he immediately sent Song Feiyan to continue the investigation and collect details that might be missed. The case unfolded in an unexpected direction at this time, and things were far from as simple as Deng Long and others imagined. It turned out that all this started from a wrongly convicted case ten years ago...