"I have said it before: everything there was merely an illusion. Even he was nothing more than a residual human consciousness of the Undead Emperor. Now that the curse which plagued him for tens of thousands of years has vanished, he has naturally returned to the main body of the Undead Emperor."
"Are you saying that the Undead Emperor’s human consciousness has awakened?"
"Correct. The Undead Emperor had always deliberately imprisoned his human memories, unwilling to be influenced by them. Now that this consciousness has awakened, he is fully aware of everything that transpired between you in the Realm of Samsara."
Chapter 315