When Wan Yuyou was ten years old, the demons invaded and her parents died. She was accepted as the chief disciple of Mo Huanyin, the master of the Molian Palace, and found out the identity of Feng Nu. Mo Huanyin asked her to go down the mountain to slay the demons. She met the best divine beast Bingyue, the demon prince Mo Xuanyou, and the demon princess (love rival) Meng Xiyue. Where will they go in the end?