A businessman

Ren Xiaosu didn't believe in ghosts and the likes, so he analyzed the situation when he saw nothing in the hollow. Wait a minute! Ren Xiaosu realized what was going on.

He saw water droplets dripping from the hollow's ceiling onto the ground.

It was probably wet due to the rainwater that had seeped through the hollow's ceiling and dripped down bit by bit. The soldier who got alarmed was merely too tense and fell into a state of panic. As a result, he thought the water droplets were caused by some imaginary enemy, like a drooling monster.

But when Ren Xiaosu saw this, he found a treasure. He said to the others, "Y'all can get water straight from here. The hollow's ceiling is a natural filter that makes the water a little cleaner than well water. Of course, if you're still worried, you can also boil it before you drink it."

Xu Xianchu asked seriously, "Are you sure this water is drinkable?"