C926 The First Challenge!

"Doctor."

Just as Zi Feng was about to leave, someone suddenly called out to him. Hearing the voice, Zi Feng turned to see who it was.

An elderly man, trembling slightly, approached him. "Doctor, I'm getting on in years. Even if this treatment works, I don't have much time left."

"I know this is risky, but my children are grown, and I have no other attachments in this world."

"Given that