C223

Gu Luocheng led the group in searching the room for a while. Soon enough, they discovered the secret room door. It was one of Old Man Gu's unremarkable pens. He inserted it into the fixed position of the pen holder and slowly opened the bookshelf behind the desk.

When the dark room appeared in front of everyone, Gu Luocheng couldn't help but laugh lightly. He could finally find out the truth