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Once you are a bad person, you will always be a bad person. During the Tang Dynasty, the warlock Yuan Tiangang refined the elixir of immortality for Taizong Li Shimin. An accident occurred during the drug test. Fortunately, his friend Li Chunfeng saved his life and saved his life. However, the effect of the medicine was too strong, causing him to become neither human nor ghost. Emperor Taizong Li Shimin couldn't bear Yuan Tiangang's departure, so he set about asking Yuan Tiangang to form a gang of bad guys in the Tang Dynasty. From then on, Yuan Tiangang retreated behind the scenes, focusing on protecting Datang and handling some things that Datang could not handle on the surface. However, in order to save Yuan Tiangang, his friend Li Chunfeng faked his own death and fell into a deep sleep...