[the tiniest chuckle] True again. Yet, there is a crucial bit of information that may change your mind. A variable, if you will, something that makes this world differ from any other.

[might as well lay it all out. Cao Pi glances around, not terribly concerned about eavesdroppers since they have a right to the same information, but by the same token, the lady did manage to worm it out of him first.]

The common enemy here is a demon, whose life force binds this world together, it's said. He is no more, but the world still exists, so something his minions are doing have managed to keep it thriving. All of us are captives here.