After Piercing the Demon King, I Still Have to Save Her!

I’ve already defeated the Demon King and saved humanity.
Me, Li Longkang, don’t want fame or glory—just to return to Earth, slack off, and live a carefree life.
But escaping the so-called fate of a hero isn’t that easy, I know that much.
Then this damn goddess keeps coming back, trying to sweet-talk me into becoming a hero again in another world—yeah, I get that too.
What I don’t get is…
WHY THE HELL DID YOU BRING THE DEMON KING HERE TOO?! (voice cracks)