C769 Let's Go(1)

Regarding the origin of the profound arts, Nangong Yu had once read the Book of Changing Heavens. It was a scroll that was left behind by the Profound Sovereign when he was still alive. It was very ancient, and it was recorded in the book.

The scroll also mentioned the Yin Arts, but it only took up a corner of one of the pages. It was too small, and no one would pay attention to it. At that time