Mi Fang (date of birth and death unknown), the word Zifang, East China Sea Qu County (now Lianyungang, Jiangsu Province) people. He was originally a subordinate of Tao Qian, the herald of Xuzhou, and was once recognized by Cao Cao as the Minister of Pengcheng. Later, he resigned from his post and accompanied Liu Bei from Xuzhou to Yecheng, Runan, Xinye, Changbanpo, Jiangxia and other places, traveling for many years. During the Three Kingdoms period at the end of the Han Dynasty, when mentioning the historical figure of Mi Fang, many people's first reaction is that he betrayed Guan Yu, leading to Guan Yu's carelessness in losing Jingshou, and thus contributing to the decline of Shu Han. However, although Mi Fang's betrayal was disgraceful, Mi Fang could be described as unfailingly devoted to Liu Bei in the beginning.

In the late Eastern Han Dynasty, Mi Fang's ancestors were merchants for generations and were extremely wealthy. Initially, he and his elder brother, Mo Zhu, followed Tao Qian, the Xuzhou pastor. In 195, Tao Qian died of an illness, and Mo Fang followed Liu Bei with his elder brother. In the ten years that followed, Liu Bei lost his footing due to defeats in the army many times, and Mo Fang always followed Liu Bei in his wanderings. In this regard, in the author's opinion, Liu Bei lost many battles in the process of the competition between the Han Dynasty and the late Han Dynasty, for example, he was first attacked by Lu Bu in Xuzhou, and then lost many times in the competition with Cao Cao. Therefore, for Mi Fang and Mi Zhu, it was entirely possible for them to abandon the dark side and follow Cao Cao and other lords. However, these two brothers did not do so. So, the question is, why did Mi Fang choose to betray Guan Yu at a critical moment when he was so devoted to Liu Bei?

In the thirteenth year of Jian'an (208), when Cao Cao personally led his army southward, Liu Chong surrendered to Cao Cao, and Mi Fang followed Liu Bei on his southward retreat. However, when Liu Bei's crowd traveled to Chang Ban Po, Cao Chun's Tiger Leopard Cavalry defeated Liu Bei, and Elk Fang fled with Liu Bei to Jiangxia. That same year, in the Battle of Red Cliff, the allied forces of Liu Bei and Sun Quan defeated Cao Cao, laying the foundation of the Three Kingdoms.

After the Battle of Red Cliff, Liu Bei led an army that captured four counties in Jingnan and borrowed the southern county from Sun Quan's side. In 211 AD, at the invitation of Liu Zhang, the shepherd of Yizhou, Liu Bei led his army into Xichuan, leaving behind Mi Fang and Guan Yu to guard Jingzhou. However, what Liu Bei probably could not have imagined was that Mi Fang, who had always been loyal to him, would choose to betray Shu Han and Guan Yu at the critical moment. In this regard, in the author's opinion, the reason why Mi Fang betrayed Guan Yu at the critical moment is mainly divided into the following points.

On the one hand, Guan Yu's slightness made Mi Fang and Fu Shiren dissatisfied. When Guan Yu was defending Jingzhou, Mi Fang was the governor of Nanxian County and was in charge of Jiangling. For Mi Fang and Fu Shiren, the two have always resented Guan Yu's slighting of themselves. Of course, Guan Yu's slighting was not supposed to be directed at Mi Fang and Fu Shiren, but Guan Yu had always had this attitude towards the scholars. The author of Three Kingdoms Chronicle, Chen Shou, once commented on Guan Yu's character traits by saying, "Yu treats the pawns well, but is proud of the scholarly men", which means that Guan Yu treats the pawns well, but when facing the scholarly men, Guan Yu is very arrogant.

On the one hand, Guan Yu's arrogance made Mi Fang and Fu Shiren unhappy. When Guan Yu was defending Jingzhou, Mi Fang was the governor of Nanxian County and was in charge of Jiangling. For Mi Fang and Fu Shiren, the two have always resented Guan Yu's slighting of themselves. Of course, Guan Yu's slighting was not supposed to be directed at Mi Fang and Fu Shiren, but Guan Yu had always had this attitude towards the scholars. As for the character traits of Guan Yu, Chen Shou, the author of "Three Kingdoms", once used the phrase "Yu treats the pawns well, but is proud of the scholarly men" to comment on this, that is, Guan Yu treats the pawns well, but when facing the scholarly men, Guan Yu is very arrogant.