"underwater sound?" Minghui's eyes lit up when she heard Xiao Yang's words.

"I thought only I heard the sound of the water myself, but I didn't expect you to hear it, too. I don't seem to have hallucinations.

"Oh? You heard that too?" Xiao Yang paused and nodded, "It seems that the sound of water does exist. Let's find out where the sound comes from.

"OK."

So they started looking around.

But the area here is so large, except for the cave, the big rock outside the cave, surrounded by cliffs and cliffs, and no waterfalls or streams were found.

Where does the sound come from?

It's not in the...