C1366 A Secret That Is Hard to Discover

When Gu Yuan was checking, he noticed that there was something different about a brick on the floor of Gu Bian's room.

So he cut open the floor and took out the brick with his bare hands.

After the renovation, the brick was covered with cement, but through the cement, Gu Yuan found that it was not an ordinary brick.

It was hollow inside, as if it had been hollowed out in the past two years