Guan Yu ordered him to turn around and come to the door of his study again. When he squatted down, he found a right-angle gap in the stall. If he did not pay attention to it, he could not see it at all. No one would have thought of putting it under it.

After opening the gap in the carpet, I found two keys lying quietly below. One is the door key, which should be right, but the other one doesn't know what to do. If it's small, it looks like a key to a safe.

Guanyu picked up two keys at the same time, opened the door, and entered...