Zhou Wen was already used to the sharp sound and didn't find it strange. However, when he heard this new sound, his eyes suddenly widened.
Zhou Wen seemed to find it unbelievable as he widened his eyes even more as though he wanted to see something clearly.
In fact, there was no need for him to do so. This was because he couldn't see what he wanted to see with his eyes. He needed Truth Listener to hear it to produce a scene in his mind.
It was an unconscious natural reaction because of his surprise.
What Zhou Wen wanted to see was the tiny bubbles produced by the plants in the water.
In the beginning, Zhou Wen didn't pay too much attention to the tiny bubbles. He only paid attention to the plant itself.
However, when the sharp sound sounded, Zhou Wen discovered something strange.