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With the rapid development of human science and technology, civilization on earth gradually appears in civilization in the universe. But at this moment, another intelligent civilization 30,000 light-years away from the earth discovered the earth. In order to prevent the earth's civilization from posing a threat to them in the future, they launched an attack on the earth. Years later, the earth was defeated miserably. The remaining humans signed an agreement with another civilization to bring the earth to the earth. Half of the area is ceded to extraterrestrial civilizations (the collective name for all unknown civilizations: advanced intelligent civilizations beyond the earth), and powerful humans can move to extraterrestrial areas to be protected by them, while those without power have to pay high amounts of money every year to survive and suffer discrimination and ridicule. But some mysterious potion changes the fate of the earth again...