C2602 Complete perfection

"Haha …"

Cheng Feng laughed: "I just want you to make things better."

"Furthermore, we have to do it flawlessly. No one will be able to tell anything from it!"

"Ah?" "Why is that?"

Medicine King Gu found it hard to understand.

Normally, people would wish to refine their own Pill. The higher the grade, the less impurities there were.

On the contrary