In the 50th chapter of the Romance of the Three Kingdoms, these two sentences are well-known stories and important chapters of the Romance of the Three Kingdoms. Before the novel was written in Chibi, Zhuge Liang decided that Cao Cao was defeated and wanted to go to Huarong Road. He watched the celestial phenomena at night. Cao Cao died improperly. Considering the feelings of Cao Cao and Guan Yu, he sent Guan Yunchang to guard Huarong Road, leaving personal feelings for Guan Yu. The novel also writes that Cao Cao really retreated from Wulin to Huarong Road, and laughed three times on the way. Zhuge Liang and Zhou Yu were not wise enough to lie in a dangerous place. Cao Cao laughed and worshipped Zhao Yun and Zhang He as enemies, so he could get away. Two laughed out of Zhang Yide, two generals, Zhang Liao and Huang Xu, boycotted Zhang Fei and made Cao Cao escape again. San Xiao is serious, laughing at Guan Yunchang. He is on the narrow road of Huarong Road, which is dangerous, while one person guards it. In addition, Cao Jun has been unable to fight again at this time. Helpless, Cao Cao had to personally plead with Guan Yu to let him go. Guan Yu read the old feelings and let Cao Cao go back to Jiangling. These two sentences mean that Guan Yu is very loyal.