"In the dark world, there exist Yiyou. They feed on human greed, and they can also create artificial dreams, whether they are sweet dreams or nightmares." With the development of the times, human greed has gradually become endless. , Which promoted the prosperity of the Yiyu race. The original form of Yanyou is a nightmare, and part of it is a nightmare that is strong enough to possess a physical form because of human greed. The origin of the race is that some high-level nightmares use their abilities to make themselves look good and desirable, thereby achieving the purpose of attracting human women to marry them. His descendants are called Yanyou, and they have the same ability as Nightmare to a certain extent. They can hide in the darkness and walk in the light. Later, some of them became infected with human greed. They were no longer satisfied with the taste of human greed, and began to plan for human desires. As the first Yanyou ate human flesh, more and more Yanyu began to eat humans, and even ate human souls. There are also some people who do not want to hurt others and choose to live in seclusion. The Yanyous gradually divided into two factions: the cannibals with the "Red Candle Sect" as their general headquarters and who care only for their own interests at all costs, and the peacekeeping species with the "Nirvana Sect" as their general headquarters and who only serve their own interests. "The war between the two religions injured countless innocent people. In response to this, humans established a countermeasure force called "Pure World" and began to massacre Hayou without distinguishing between ourselves and the enemy. Members are good at channeling. "Under the instigation of the Red Candle Sect, the Nirvana Sect was finally destroyed. After the leader Lan Ming died, he kept looking in the direction of the Central Plains, his eyes never closed... And in that rich land, his unknowing son was growing up healthily...