The story tells about Red Boy, who has been accepted as a good fortune boy by Guanyin, and follows his master's order to go to the Tianji Trial Society for training. He wants to be a hero, but he is rejected by everyone because of his half-blooded identity of a fairy and a demon. Faced with everyone's misunderstanding and the impending catastrophe of the three realms, Red Boy resolutely abandons his prejudices and his competitive spirit at the critical moment, bravely faces evil together with Nezha, Xiaolongnu and others, and finally defeats the devil and wins the recognition of the world.