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The Greatest Villain Returned: My Role Is My Wife's Furnace

The Greatest Villain Returned: My Role Is My Wife's Furnace
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Zero was a victim of the War of Harem.
Two years of his journey as a demon in a world resembling a game he once played ended in a tragic death.
Fortunately, his soul returned to Earth.
On Earth, he was no longer Zero, the Greatest Villain, but Ernest, a runaway child haunted by an inferiority complex.
Until ...
"So, you wanted us to get married so that you could make me your furnace?"
He ended up being a furnace for his new wife.
Behind his role as a furnace husband, he gathered strength from the shadows to prepare for another catastrophe.
Because he returned to Earth 10 years before he was sent to the Netherworld.