In the "Romance of the Three Kingdoms", although Liu Bei's own comprehensive ability is not very strong, because of his closeness to the people, he attracted many benevolent people to his command, such as Zhuge Liang, who was invited by his three Gu Maolu, as well as Ma Chao, Zhao Yun, and Huang Zhong. Zhuge Liang is a major strategist of Liu Bei, this is beyond doubt, the reason why Liu Bei has such a great achievement is indispensable to Zhuge Liang's credit. However, there was another person in Liu Bei's camp, although his fame was no better than Zhuge Liang's, but in terms of scheming, he did not lose Zhuge Liang at all, and this person was Xu Shu.
Xu Shu was originally loyal to Liu Bei, but then something happened that forced him to resign to Liu Bei. His mother was captured by Cao Cao, who used it to threaten him, so he had to go to Cao Cao. At that time, he went to Cao Cao's side, but his mother was furious because he betrayed Liu Bei and hanged herself before Xu Shu could explain. Xu Shu was greatly stimulated, and he vowed not to give another plan to Cao Cao.
At that time, although he was in Cao Ying, his heart was in the Shu Kingdom, and he was still worried about the every move of the Shu Kingdom. Even when Cao Wei was at war with Western Shu, he still secretly helped Liu Bei. Once, he cooperated with Zhao Yun, Guan Yu, and Zhang Fei to kill Cao Ren without leaving a piece of armor, and from here it can be seen that Xu Shu still has feelings for Liu Bei.
However, Xu Shu's mother was already dead, and he had nothing to do with Cao Wei, and he could return to the Shu kingdom and continue to be loyal to Liu Bei, but he chose not to go back, why was this? First of all, at that time, Liu Bei had already taken care of Maolu, and the Shu kingdom had already begun to go uphill, and Liu Bei already had Zhuge Liang by his side, although he would not sincerely help Cao Cao, but there was no need to return to the Shu kingdom.
Secondly, although it was not a blatant surrender, Xu Shu had already betrayed Liu Bei from the moment he came to Cao Cao from Liu Bei's side, and if he continued to defect to Liu Bei later, it would inevitably fall into the tongue, so he simply did not go back.