Jeoldaejado Appaneun Cheoeumira

After falling into another world due to the appearance of a gate, Lee Kang-jun spent fifty years conquering the vast Anux Continent, rising to become its emperor and reigning as an absolute being. As a ninth-circle necromancer, he slew dragons, crossed dimensions to wipe out demonic realms, and even traveled to the martial world to defeat the Heavenly Demon and the Martial Alliance leader. After more than three hundred years of searching for a way back to Earth, he finally makes it home… Only for his sister to shove a chubby, warm little lifeform into his arms.

“She’s your daughter. Her mother died during childbirth… do you remember her at all?”

“Ba-bba—!”

That was before he even finished conquering the Anux Continent— meaning it happened over three hundred years ago.

“…Right, sure. You were some insanely powerful emperor of another continent. You were trapped in a gate for three years and came back—guess it’s a relief you only ended up with delusions.”

Even if she’s his only sister, treating him like a lunatic is downright rude. The one thing he can’t argue with is this:

“But she’s your daughter, so take good care of her.”

He had planned to live a quiet, peaceful life after returning to Earth anyway. So from now on, as an absolute being, he’ll go all out to pave a flower-strewn path for his daughter, Seol-i’s future.

(Source: KakaoPage, translated)