Hundreds of millions of years ago, the galaxy suffered a catastrophe, and the surviving interstellar creatures fled to the earth, creating an eighteen-layered inner earth world. The void black stone deep in the earth's core maintains the entire space, and relies on its own magnetic field to establish the law of reincarnation and promotion of good and evil. However, the dark forces that covet the power of the black stone attack the core. The black stone shatters and the fragments are scattered across the layers. The order of the earth's core is on the verge of collapse. Only four people who carry the four original fates of love, courage, greed, and desire can repair the black stone and save the inner earth world that is about to collapse.
