In the vast and mysterious world of prehistoric times, the witches and liches clash endlessly, devastating the world. Human leader Li Mu rises to prominence through his unique genetic cultivation system, forming an alliance with the witches to jointly confront the crisis. Human technology, with its two-dimensional foil sealing sages, stands out. Conscience-bound, Hou Tu, determined to relieve the suffering of all beings, resolutely transforms into a reincarnation. However, blessed by the merits of the Great Dao, she is reborn and transcends to the realm of sage. Later, Hou Tu establishes the Underworld within the depths of the Sea of Blood, constructing facilities such as the Six Paths of Reincarnation and the Eighteen Levels of Hell. The witches and humans work together to fill the Underworld. Li Mu, for aiding Hou Tu's reincarnation, earns the merits of the Great Dao and the authority of the Emperor of Fengdu, becoming the incarnation of his cellular will and ruling the Underworld. Reacting to this, the various factions begin a fierce battle for supremacy over the Underworld and prehistoric times...