Li Mu was deeply astonished.

It felt like an ordinary schoolboy he knew all along had solved the Goldbach Conjecture. What was going on? It was not long since Qing Feng started studying Taoist refining art and alchemy. But by then, he was already able to refine Taoist instruments?

Li Mu held the silver pellet in his hand and injected a ray of spiritual force in it. Immediately he saw the inside of the pellet. There was a small space, like a case for storing swords. ...