Shen Jian, a modern criminal investigation officer, died unexpectedly, and his soul was transformed into a poor and humble man in Chang'an City of the Tang Dynasty. Relying on his forensic knowledge that was ahead of his time and his keen observation ability comparable to that of a "human polygraph", he discovered shocking and suspicious clues from the corpse of a nobleman who was deemed to have "died violently due to a sudden illness", and thus became involved in a serial murder case involving the royal family, the military and local powerful people. Not only did he have to stay with the corpse and peel off the cocoon, he was also forced to form an "officially designated" partner with Chu Yunshang, the stubborn daughter of the Minister of Dali Temple. From the murder of gangsters in the streets to the mysterious deaths of soldiers on the border, from the political battles in the court to the intrigues in the world, Shen Xiaoguan used his body as a widower, a sword as a pen, and a corpse as a book to stir up the world. He solved the mystery while laughing and cursing, won awe with his professionalism, and resolved the crisis with his "cheeky talk". Finally, he carved an immortal legend belonging to a "coroner" on the scroll of the prosperous Tang Dynasty.
