C366 Chen yang's conjectures!

The yin-yang bead, had temporarily named the pearl the yin-yang bead!

The last time Chen Yang came, he was already very curious about this yin-yang bead, and was only researching it, in the end he could not figure out what exactly this yin-yang bead was.

At least in his impression, he had never seen it before. Even the ancient texts didn't mention anything about it