In the 20th year of the lunar calendar, an unknown race appeared in the human world. Their heads have some characteristics of sheep, they have a hot temper, are ferocious and cruel, and feed on humans, so they are called "Yang" by humans. In the twenty-ninth year of the celestial calendar, mankind has experienced five years of darkness under the tyranny of the Yang tribe. Humanity has suffered a devastating blow and its population has plummeted... Almost only the population of the royal domain with a special geographical location is left. This year, Wangyu was targeted by the Yang clan. At this moment, this closed country began to implement "migration" and took the initiative to hand over 100,000 humans to the Yang tribe...