During the Tianbao period of the Tang Dynasty, the poet Li Bai was summoned to the capital by Xuanzong to serve as an envoy to the Imperial Academy. At first, he was very proud and wanted to make a difference. But this was the late period of Xuanzong's reign, and politics were becoming increasingly corrupt and dark, and it was impossible to give Li Bai a chance to display his talents. Li Bai drank wine day and night to relieve his worries. One day, Li Bai just finished drinking and returned to his residence drunk. A bachelor named Li Mo came to Li Bai's residence with a child who was just one month old, and said to him happily: "Li Hanlin, look at my little grandson, how cute he is. You are very knowledgeable. Please give the child a name." Name it!" Li Bai looked at Li Mo's grandson with a drunken look, then picked up the pen and wrote 20 words: "Who is there under the tree? I am so kind to you." Mo looked at it and thought, Li Bai was really drunk and asked him to give a name, but he wrote a poem, so he left and said: "Originally, I asked Hanlin to give me a name, but you wrote a poem instead. I don't understand what it is." Meaning. You are drunk, please rest!" He hugged his grandson and left unhappily. Li Mo returned home and told his family about the matter. A Juren happened to be a guest at home. He said to Li Mo: "There is a lot of meaning in these lines of Li Taibai's poems. The people under the tree are 'Mu'zi' , that is, 'Li'. Buyu is 'Mo' Yan, that is, 'Mo'. Hao is 'daughter', son of a woman, 'grandson'. The word "Wu" is also the word "Xu". Yanfei Xie Chengbao, "Yanfei" is "Yun", "Chengbao" is in "Feng", and the combination of these four poems is "Li Mo". When Li Mo heard it, he realized that it was a riddle of a poem. He was very satisfied with the name "Xu Yunfeng". Li Mo's grandson has always used this name since he grew up.