After humans had expelled demons from the Alkaid World, they formed different families and sects. The Alkaid World had welcomed the age of families and sects since then. The ninth-grade family or clan would rule over a city, the eighth-grade would rule over a county, the seventh-grade would rule over a state, the sixth-grade would rule over a kingdom, and so forth. Chen Yang was transmigrated to this world with the Akido Pearl. With it, he raised a group of beasts with powerful bloodlines and even built a farm to lead the Chen family to achieve the title of the Saint Family.
as of chapter 127, the only significant plot hole in this novel surprisingly comes from Jackie. It's really unrealistic for Mercer not to consider that Jackie will not betray him if arasaka threatens to kill his mother. Didn't Mercer consider this at all when he's recruiting Jackie? What if he's blackmailed by arasaka, can he just abandon his mother for the group? and why didn't arasaka use Jackie's mother as a blackmail material when hunting Mercer group in the first place? as far as I know the only member that still has family is him. at the very least arasaka should've attempted it. overall it's great