C21 Cultivation Path Qi Refining

"Strange, how could it be uncultivated?" The burly middle-aged man became more and more strange. From time to time, he would raise his head to size up the two of them. He didn't lower his head to think, and after a long while, he still couldn't figure out what was going on.

In his understanding, Qi Refinement could not only strengthen the body but also lengthen one's lifespan