C905 Bai Ling

Seeing Hsu Mu's surprised expression, Qing Yi smiled and said, "I heard that you are from the outside world, so I'm sure you don't know the origin of this so-called Yellow Springs Essence, right?"

"I really don't know. Please enlighten me, Senior!" Hsu Mu replied respectfully.

After thinking for a while, Qing Yi said, "The so-called Yellow Springs Essence is something that knows Yin and Yang