In the Jiuzhou Continent, the Immortal Way is prosperous, and everyone in the world is proud to worship the Immortal Sect. However, cracks in the boundary wall suddenly appeared, and demons from other worlds began to sneak into the Kyushu Immortal Sect secretly. After the alien demons infiltrated into the major immortal sects, they tried to gradually take over the power of the immortal sects and attempted to subvert the Kyushu Continent. Sword Immortal Mu Xun and his friends stopped the demon invasion, but unfortunately fell into the demon trap and were mistaken for a traitor from the immortal sect. In order to look for opportunities and clues to the lurking demons, Mu Xun decided to hide his traces and never show anyone else, and handed over his only son Dongfang Hao to his wife's clan to raise and take care of him.