In the alien space, the Holy Realm of Light and the Demon Realm of Darkness have nothing to do with each other. One has no darkness and the other has no light. The God of Creation sends people with bright natures to the Holy World, and leaves people with dark natures in the Demon World. The blood is inherited and passed down from generation to generation. But the God of Creation never thought that human nature would change. Eventually, everything will change and everything will return to where it started.