Under the city of the divine capital of Dayin Dynasty, the appearance of prosperity hides murderous intent. Pei Yin, the head of the Criminal Department, possesses the special ability "Tongyou". He can communicate with the souls of the dead and see the truth of the murder when he is about to die. However, he suffers from amnesia and mental torture due to the backlash of his ability. The corpses hanging on the stage with their painted faces peeled off, the bizarre "sitting" of monks in ancient temples, the "corruption punishment" copper coins for floating corpses in canals... Behind a series of murders that are rumored to be "evil troubles" is the control of the mysterious organization "Netherworld Dao" - they covet the taboo secret technique of the previous dynasty "Nine Nether Souls", and attempt to use deception to gather power, subvert the imperial court, and pursue eternal life. Pei Yin's superpower is actually an "accidental product" of the secret technique, making him a dual existence as a pursuer and a prey.
Pei Yin formed a detective team with the female medical officer Su Zhi, the rogue Yan Chiyun, the veteran official of the Ministry of Justice Chen Yan, and the prince Xiao Jingyan, and went deep into the mystery of the puppet murder in the ghost city, the crisis of the palace curse, and the chaos of the "demon soldiers" at the border. As the investigation progresses, Pei's hidden life is gradually revealed: he is a survivor of a secret experiment, his parents were killed for guarding the forbidden power, and the Lord of the "Netherworld Way" regards him as the core "vessel" of the ritual. When the blood moon phenomenon suddenly appeared in the city of gods and the earth shook, the Lord opened a rift in the underworld in the underground palace of the emperor's mausoleum in an attempt to summon the power of evil. With the help of his best friend who sacrificed his life, Pei Yin used his supernatural powers to counter the secret technique and launched the ultimate showdown with the Lord.
In the end, he used himself as bait to destroy the ritual, but lost his power in the awakening of his powers. After a tragic sacrifice, Pei Yin and Su Zhi returned to their hometown in seclusion. In the prosperous age, the dust-covered secret legends and the unresolved shadow of power are still stirring in the dark...
