Who Rules the Ups and Downs of Another World?

(The writing style is more relaxed, not too abusive, I hope it can give everyone a relaxed reading mood. 600,000 Words for the public, it won't be that bad^^, right? Please don't despise it as only 800,000, its content is compressed by 1 million. ) Nie Fan, known as "Wu Dao", died in an operation to save his companions. He was reborn in another world as a beggar under the age of ten with the "Secret Book of Promise". By chance, he was adopted by the head of the Wu family, the first family in the border town, as his adopted son. A new legend began... Low-key and arrogant, his tough life requires no explanation. The wind and clouds are surging, who is in charge of the ups and downs!