What is the relationship between the glory of the king's commitment and Li Bai's Xuance? Reveal the glory story of the king keeping his promise.

Baili Shouyue and Baili Xuance had no parents since childhood. Their father knelt under the Great Wall and their mother passed away. They did odd jobs since childhood. But as brothers, they still teach their younger brothers some skills instead of their parents. What a good brother. However, things are unpredictable, and the days of peace will eventually be broken. One day, many people gathered in the market, and the team of bad guys and horse thieves took the opportunity to attack the market and destroy it everywhere. The villagers went to the garrison gate to help defend their hometown, so they kept their promise and agreed with Xuance that "Xuance will be fine, and Xuance will wait for you at home. No one can call it out. " Later, I also went to help. At home, Xuance rushed to protect the old and weak who were hijacked by horse thieves. He didn't keep the agreement and couldn't find Xuance when he came back. Li Bai Shouyue has no name. In order to fight for the Great Wall guards and welcome his younger brother back, he changed his name to Li Bai and kept his promise. This is why keeping a promise in a hundred miles is called keeping a promise in a hundred miles