```
Zhang Xiaofan simply sized up Old Doctor Zhou from head to toe.
"One needle is all it takes,"
he said indifferently.
"What?"
"Haha!"
"Young man, to posture in front of me will be the biggest mistake of your life,"
Old Doctor Zhou said, laughing aloud.
"You inherently lack kidney qi, which causes you frequent lower back pain, weakened immunity, aversion to cold, and, in that area of life, you were already inadequate when you were young."
"You must have tried all sorts of methods and taken countless medicines, but you have never been able to change it,"
Zhang Xiaofan said with a faint smile.
Upon hearing this, Old Doctor Zhou's face changed.
Then he furrowed his brows tightly.
"How does he know my condition!"
"Just by looking at the surface?"
"Impossible, mere observation couldn't possibly reveal my issues!"
Zhang Xiaofan continued, "Don't look at me like that; I knew your problem as soon as I saw you."
