During the Three Kingdoms period, Jiang Wei, a general of Shu Han, was Zhuge Liang's favorite disciple. After Zhuge Liang's death, he continued to resist the Kingdom of Wei, but was eventually trapped by Deng Ai and Sima Zhao in 264 and committed suicide. According to historical records, Jiang Wei said to his opponent before his death, "I had no intention to kill you, but now I am forced to do so by you. I have to kill myself." This statement expressed his helplessness and tragedy.

However, it was even more surprising that the second year after Jiang Wei's death, a secret letter emerged, revealing Zhuge Liang's deep trust and expectations for Jiang Wei. This letter was written by Zhuge Liang to Liu Bei before his death, in which he predicted that Jiang Wei would become the pillar of Shu Han, and his death would be a sign of Shu Han's doom.

The emergence of this secret letter gave people a deeper understanding of Zhuge Liang's wisdom and foresight. He not only recognized Jiang Wei's potential during his lifetime, but also accurately predicted the fate of Shu Han after his death. This kind of profound wisdom and foresight made him one of the greatest military strategists and politicians in Chinese history.

Overall, Jiang Wei's death and the emergence of the secret letter both prove Zhuge Liang's foresight and wisdom. His prophecy was not only accurate but also deeply influenced the history of Shu Han. This is why later generations always marvel that Zhuge Liang really didn't misjudge people.

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