C226 Invitation from the Zhang Family

"Boss, is your duty as a doctor?" Yan Sizhu asked in disbelief.

"Of course." Yang Chen said with a smile.

Looking at Yang Chen, Yan Si Zhu had a complicated look in his eyes. It was this man who developed such a crazy growth catalyzing medicine, and actually became the world's first doctor to cure a cerebral palsy! If it weren't for the fact that he had personally witnessed this report