First of all, I wish White Dragon King RIP. If we believe in multi dimensions. It is not an ending for him.
The story start from he is actually a poor mechanic at one time. One night he dreamed of he is the white dragon. From then on, he has been popular and it is like dragon that help many people around Asia to success in their career especially the HK actress.
By why just after a dream? Is it because of he has the ability to communicate with the E.T? Or he has the knowledge to cross multi dimension and look for the knowledges? Why he is like able to see futures of some HK stars and make them believe in him and his teaching?