C628 Mysterious spirit gu technique

At first, Lin Yiyuan could not tell where the voice came from, to the point that Sa Lin subconsciously thought that he did not understand much about Gu arts, but now, he suddenly asked about the relationship between Spirit Gu and Spirit Gu techniques.

As the saying goes, an expert would know whether or not he had the ability to do so the moment he made a move.

This question stunned Sa Lin