Human history. 31St century——
The earth 500 years ago was overcrowded. Therefore, the Star Alliance decided to develop other planets. Find some better planets to live on. So the legendary nine planets appeared. They are:
The first planet. Sky, moon and stars. Inhabited by ancient gods and demons and their descendants. It can also be said that this star is the 'world of gods and demons'.
The second planet. Blood God Star. A world of vampires, zombies and skeletons. But. The owners here are vampires. [Author: The vampires are commonly known as vampires]
The third planet. Chaos Star. A world of cultivators, necromancers, and clans in the demon world.
The fourth, fifth, sixth, seventh, eighth and nine planets are respectively the Yunvxing, Youxingxing, Qingchengxing, Tianhaoxing, Mingyuanxing and Dingmeixing. These six stars are the human world. Each planet is protected by three to five ancient martial arts families or superpower families. So that there won't be an interstellar war.
At the same time, there are also guardian saints on earth. That is [Dragon Island? Paradise], which is entrusted by the Tianlong clan to protect the earth. It can also be said that if [Dragon Island? Paradise] does not fall. The earth will live forever.