Please Find a Book! in Ancient Times, an Opportunity Was Given Once Every Three Years and Returned a Hundredfold. 求找书！洪荒，三年送一次机缘，百倍返还。

Later it became a gift of 3,000 yuan a year. The protagonist starts as a dragon, and later returns the bloodline to become a true dragon. Made a deal with Zhulong. Having helped the human race is like becoming a disciple to the heavens. There is a cave, Penglai level. Are you friends with Duobao?