After Zhang Fei's death, Liu Bei said 4 words, and Zhuge Liang thoroughly saw Liu Bei's true face, which happened on the march of Liu Bei to launch the Battle of Yiling, because Guan Yu had just died not long ago.
Zhang Fei
Liu Bei could not resist the anger and led the army to attack Eastern Wu, when Zhang Fei used wine all day to dispel his sorrows because of the news of Guan Yu's death, and after getting drunk, he also whipped the shi clan, so that Zhang Fei took advantage of Zhang Fei's sleep, cut off his head, and then fled to Eastern Wu with his head and intelligence, at that time Liu Bei was still dealing with military affairs, after hearing the news of Zhang Fei's life and death, he just said 4 words lightly, I knew, and then continued to deal with government affairs, there was no sense of grief, this situation was learned by Zhuge Liang Zhuge Liang also understood. In fact, Liu Bei's expedition was nominally under the banner of revenge for Guan Yu, and he hyped up the friendship between their brothers, but in fact, he never defeated Guan Yu, and in the case that he himself was already called emperor, he did not add a nickname to Guan Yu.
Liu Bei
At first, Zhuge Liang thought that Liu Bei was just the reason for his busy official duties, but now that Zhang Fei has come, Liu Bei has the same attitude, indicating that Liu Bei has no feelings for them anymore. When Liu Bei took Xuzhou that year, he took Guan Yu south to conquest the elements, leaving Zhang Fei to guard Quzhou, but he did not expect to let Lü Bu take advantage of the void, Xuzhou was also taken away by Lü Bu, and the results of the three brothers' struggle for ten years were destroyed. Although Liu Bei comforted Zhang Fei at that time, he actually already had mustard in his heart. Liu Bei was very disappointed in Zhang Fei, so when he heard the news of Zhang Fei's death, he just said, I know. This time, Zhuge Liang also saw Liu Bei's true face clearly.