Poor care of the fat fairy gave Dapeng a chance to escape with trickery.
The Buddha ordered the dragon to descend to Dapeng to exorcise demons and save the world and the people.
Note: Only the fat fairy boy was exiled to the world, and the spiritual Zen son needed to be reincarnated because of his damaged foundation. So, he came to the world to practice, and the dragon Lohan surrendered to Dapeng, exorcising demons and saving the world and the people.
If you don't know, Dojo will marry Rouge and break the precepts. Besides, if you don't know, who will lead them to exorcise demons? Dapeng hates Xiaopang Xiantong, Lingchan Zi and Dragon Luohan very much, and there is no magic after reincarnation, so people who have something to do (Daoji who wants to exorcise demons) have an epiphany, think of past lives, and protect Lingchan Zi and Xiaopang Xiantong.