C21 There are many advantages

Tang Wenrun nodded, and thought back to the box he had picked up in the river. Just from the outside, he could not open it, and furthermore, he could not forcefully open it.

This attracted Tang Wenrun's curiosity, and once again, he focused and looked at the map in the cabinet. He found out that the situation was the same as before, which made him unable to help himself from muttering to himself