Waaiaiiit I AM CONFUSION. So the white haired demon is Xuan Yue, right? Ao Ao's past life?...

Ao Yue was the second Prince and Ao Gu's brother. When the emperor sealed the soul of demon (Xuan Yue) to his son the second price. The emperor banned the name Ao Yue that's why they call him now as Ao Ao. So basically they are all Ao Ao in the present.

Thank you this makes so much sense now thanks (▰˘◡˘▰)

Thank you so much for explaining ❣ now I understand.