The chunky teenager Lu Xiaohou is obsessed with immortal cultivation, acting recklessly and daring to charge forward. At the start, he enters the underworld four times, constantly honing himself through perilous and desperate situations. Accidentally stumbling into a secret realm where everyone around him is a hidden master, he mistakes it for an illusion. Spiritual beasts acknowledge him as master, and he subdues divine weapons of all heavens, willfully roaming and stirring up numerous troubles. No one knows his origins, and the heavenly way will initiate a God-Investiture calamity that reshapes the three realms because of him.