After Twelve Births

It tells about the changes in world affairs and the karma between the twelve kingdoms. It's just a bunch of crazy things. Why did the male protagonist who lost his memory suddenly return? Is it a coincidence or a plan? Why are the brothers and sisters sitting in the main city blocked at every turn? Is it a conspiracy or fate? The secret of Shendi's destruction? Why did the disasters that befell this world arise? Is all this the result of human nature or the law of nature? With the return of people and things belonging to distant memories, can everything be cleared up?