Walking to the desk, Yang Tian gently takes away three books, and then finds a red button in the back. After five taps on it, the desk creaks. Then it can be seen that the desk is divided into two parts, revealing a corridor for two people to pass through.

Yang Tian pulled at the corners of his mouth, and a faint smile appeared. After that, he walked in with a light step and turned back to say that the door was closed.

the corridor is paved with bluestone floor tiles, and there is always a bright incandescent lamp every five meters. In addition, there is only one unsettling tranquility...