Modern forensic doctor Han Qiu accidentally travels back in time to the Great Yu Dynasty and joins the Imperial City Division as a low-ranking constable. Using modern criminal investigation and forensic examination techniques, he uncovers hidden clues on corpses and solves one long-unsolved mystery after another, including locked-room murders and serial poisonings. Corrupt officials repeatedly obstruct his investigations, while wrongful convictions pile up and the bones of the dead cry out for justice. With his extraordinary skills in forensic examination, Han Qiu exposes the real culprits and clears the names of the wrongfully accused. Step by step, he stirs up a storm in the capital and becomes a legendary detective renowned throughout Great Yong.