While searching for his sister who had been missing for four years, he was selected by the Yin Division as the thirteenth spirit-traveling forensic doctor. His duty was to return to the scene of the crime, solve the real mystery, and help the innocent souls resolve their obsessions. Since then, under the arrangement of the Yin Division, many strange and bizarre supernatural cases have been solved.
There are forensic doctors and policemen in the human world, and there are yin messengers and judges in the underworld. There are places between yin and yang that they cannot touch. This requires the forensic doctor to take action.
Hell is empty and the devil is in the world.
Behind many mysterious cases, there is a huge conspiracy of the Yin Division - these supernatural cases mixed with huge injustices turned out to be Cui Yu, the head of the judgment of the Yin Division who specializes in yin and grievances.
The struggle for power has existed in ancient and modern times, both in the world of heaven and in the underworld.
