C233 Teaching furnace explosion

"I use a furnace, pill master. Sometimes, even ten batches of furnaces can't form a single pill. You are such a powerful Guild Master, how could you just open your mouth and take it? "

"What!?" Ten batches won't even make a single one, your brother is not going to teach you! "

"The temperature of the furnace is not easy to control, it's useless to teach it." Ye Feng answered