When Chen Tianci (Agou) was thirteen years old, the village suffered a strange rainstorm. During a thunderstorm, the evil spirits that had been suppressed for centuries broke out in the temple. The old monk who raised him ran out of gas and oil. He only left one sentence before his death: "You are the reincarnation of the Tengu, and you are destined to fight against demons in this life." You must shoulder your mission. From then on, Agou embarked on the road of cultivating Taoism and conquering demons. He met the one-eyed boatman He Laoliu who ferries the yin and yang, the mysterious mountain villa that was entrusted by the fox demon to exterminate the family for blood debt, the possessed lady who sang at midnight, the Miao village grandmother who lived for three hundred years... Every seemingly ordinary person has a shocking secret behind it. What's even more frightening is that he discovers that it all points to the same existence - the Ghost King. And the man whose body was taken away by the Ghost King was Taoist Master Qingfeng who had saved his life. With the blood moon in the sky and the decisive battle between good and evil, Agou finally understood that Tengu swallowing the moon was not a legend, but his destined fate. In this battle, he wants to save not only his friends, but the entire world.