Like the other officials, Fan Jianxi had been arrested and was in prison. Therefore, he was living in the posthouse. It was inconvenient for him to run back and forth between the government offices. Therefore, Shi Che did not stay in the posthouse. Instead, he stayed in the government office.
This was also why soldiers were guarding the entrance of the government office at every hour.
Shi Che was in the government office, so there were many more guards in the office than before. They were all wearing armor and were all soldiers.
When Xue Yan arrived, he happened to come when the soldiers were changing shifts. It was during this gap that Xue Yan silently entered the government office.
After entering the government office through the roof, Xue Yan could see that the lights in the study room in the main courtyard of the government office were on and the windows were open. Shi Che was still awake and was still sitting at his desk dealing with some matters.