C119 First Step into the Dao of Alchemy

As the elder guardian sighed, Mu Chenyu did not cease his deepening understanding. He gradually penetrated further into the profound layers of the Dao of alchemy, even beginning to touch upon the most exalted aspects of the craft.

"Three days have passed."

The young man's mental fortitude was astonishing. It was unexpected that he could sustain such focus for so long