C545 Treating Old High

The simple wooden door creaked as if an old man was on the verge of death.

"Who are you?" From the looks of it, he seemed to be a middle-aged man, at most fifty years old. He did not expect that this person would make Li Su surprised by his voice. How was this a fifty year old man?

"Your surname is Gao?" Li Su probed.

"I am, who are you?" Old Gao's eyes were full of vigilance