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Five hundred years ago, the demon god and the heavenly war god died together, and the demon soul's seal was loosened. The regent of Beiyu, Yan Jinxiu, was poisoned by demons. The demonic beasts from southern Xinjiang frequently appeared in the world but did not enter reincarnation. In the underworld, the amnesiac ghosts appeared in the underworld. In order to resurrect the demon god, the demon tribe went undercover to the Tiancang sect and used the "human demon alchemy" technique to help the demon god break the seal. The demon poison spread to the human world as a plague. At this point, Qi Xiaonian, the second princess of the underworld, sneaks into the human world to investigate the case, and encounters Yan Jinxiu who is suffering from a demon poison. The resonance of their jade pendants led to the remains of the ancient demon sealing formation. She reached a deal with the regent on the condition that she could detoxify Yan Jinxiu, and the two investigated the case together. You use your flesh and blood to seal my demonic poison, and I will spend the rest of my life to save you from death.