C181 Awakening of Red Pupil
According to Sun Wanli's own son, Huang Tiancheng was locked in the room on the second floor closest to Sun Wanli.
In fact, the moment he had left the city that night, he had been controlled by Sun Wanli. He seemed to have already expected the result of the party, so he made two preparations in advance.
This was one of the reasons why he didn't chase after and block Guan Yang