After the fall of Shu that year, Zhong Hui planned a rebellion, and the first step of his preparation was to falsely accuse Deng Ai of treason.
Later, Wei Guan participated in inciting the soldiers to start a mutiny against Zhong Hui and end the rebellion.
Throughout Emperor Wu's reign, Wei Guan continued to be an important official and general, serving in a variety of roles capably.
Wei Guan was one of the few officials who dared to openly speak to Emperor Wu about his choice of heir apparent, his son Sima Zhong, who was developmentally disabled.
[5] Wei Guan and Sima Liang tried to get the government on track, but Empress Jia continued to interfere with governmental matters.
Empress Jia, who had already resented Wei Guan for having, during Emperor Wu's reign, suggested that he change his choice of heir apparent, also wanted more direct control over the government, and therefore resolved to undergo a second coup.
His forces thereby surrounded Sima Liang and Wei Guan's mansions, and while both men's subordinates recommended resistance, each declined and was captured.