C414 If the Brain Deceives Itself

Holding a small tuning fork in his hand, Chen Qun gestured to Cheung Yihfei and said, "Please close your eyes, old sir, and test if your left ear has improved hearing."

Cheung Yihfei slightly sighed and shook his head, "I can probably hear a very loud sound, but I can occasionally hear other normal voices. I don't know if this is due to my psychological effect