The series is based on a number of classical Chinese literary masterpieces, telling the story of Wu Jin, a demon exterminator with the power of the moon man, who travels the world and vows to eliminate all demons. He accompanied Shui Yao, a remnant of the Changxiu Kingdom, Song Zhiru, the first female shopkeeper of Tianluo Town, and Li Yan, an upright scholar, to work together to solve the mystery of the demonic evil. As the truth of the mystery is revealed one after another, when Wu Jinshuiyao secretly feels love, the dark secrets of the past surface, the world is in danger, and everyone will usher in the most severe test.