C373 Sleep work

This old man Hu Yifu indeed had an extraordinary cultivation method, which made Liu Rufeng very surprised. Nine cauldrons refining the spirit, just listening to it was enough to fill one's stomach.

Although according to Hu Yifu's words, it would take at least three years for the nine cauldrons to step into the Innate Realm from the Pre-Sky Realm, Liu Rufeng still decided to give it a try