C533 Seeing Ling Yushi Again

Xu Liusu didn't know, but he took out a second stage middle stage pill.

Then, the system asked, "System, how about upgrading this pill?"

"Ding! Upgrade is ineffective. Only a second stage Pill Master can upgrade a second stage pill!"

Xu Liusu nodded and said no more.

The system is a heaven-defying tool. Just like a master teacher, it can guide one through alchemy.

Therefore