chapter 498 Alchemy Competition

Bi Gongyu worked without sleep for the past seven or eight days, and devoted almost his entire body and soul to alchemy.
He had only comprehended about half of the alchemy techniques taught by his master. There were still many parts that he could not comprehend, and he had many questions in his mind.
Verdantius Liu came over, and Bi Gongyu hurried forward, saying that only the master could answer his questions.
"How's it going? How confident are you that the Lingdan will work?"
In...