PREVIEW
... a rectangle in the shape of a door.
Most people who come in would probably look at the bookshelves, after all, the bookshelves seem to be the most suspicious. Thus, they would ignore the more obvious walls.
In fact, the people who set up this mechanism were relatively smart.
Shao Qing pushed the bookshelf away and then began to study the wall carefully. As she was studying it, a gap suddenly appeared in the wall and a door opened slowly.
You can still hea ...
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