C513 Underground Monitoring

At five o'clock, when the sky was darkest, the door of his room opened and a figure slipped in.

It was Yang Xuan!

Speaking of which, Yang Xuan really did put in a lot of effort. These doors had very strong anti-prying abilities. He did everything he could think of to enter without alarming Wang Zhiyuan and Liu Shiyun.

He immediately started to inspect the room