An Zhichen entered the palace, and shortly afterward, news spread from the palace that he had been cast into the Heavenly Prison. The Heavenly Prison is a place where serious criminals are detained; those who enter seldom come out.
Xiang Wei received this news and was extremely anxious: "Even if the Earl privately deployed military forces, it shouldn't warrant being cast into the Heavenly Prison, should it?" Yueyao hadn't told Xiang Wei that the Emperor had permitted An Zhichen to deploy military forces within certain limits, which was why Xiang Wei was so worried.
Yueyao also didn't expect the Emperor to be so harsh, to directly cast An Zhichen into the Heavenly Prison. However, doing so had a better effect. Since she initially didn't inform Xiang Wei, there was no need to tell her now; the more people who knew, the greater the risk of leaking the information.
