This book is purely a work of the author who wrote down his thoughts 6 years ago in order to fulfill his childhood dream [that is, to publish an article]. The plot is all kinds of nonsense, yes, all kinds of nonsense, the characters of the princes have deviated from the original channel for a long time. The beginning is about the prince who is about to be an uncle [in the future, most of it may be a memoir]. There is almost no space related to tennis. The main plot is the dragon horse and the heroine. Others may not play a big role. The writing is not very good. The structure is flawed. It may be a black hole to trap the grandfather. It is purely for self-entertainment. Please don't spray if you don't like it. Again, please proceed with caution.