C172 Yan Wu Dong

During these six days, Lin Cheng had never left his room. He had been seriously studying the pill formula and refining the pill.

In fact, to him, he only used a day's time to completely remember over two hundred pill formulas. Among them were a few new pill formulas, but the rest... In fact, Lin Cheng only needed a glance to know what other materials could be used to replace them