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The king of all dead, and the despair of all living.
The man who devours the kingdoms of living, and devouring the breaths of those who breathe.
The man who had sentenced a world to its destruction, has...
Jumped across a chasm of time to return to the modern world!
"Seriously, can't I enjoy a peaceful life after going through such a sh*tty-a*s experience like that?!"
But, a danger approaches the man wanting to enjoy the freedom of the modern society.
Stop the destruction of this world!
And now, the story of the world's least trustworthy hero starts!

Translator's synopsis:

This story is centered around the man named Yi Ji-Hyuk, who has spent 1000 years in a Medieval Western fantasy-like world before returning back to the modern-day Earth. When he returns, he finds that his home is facing monster threats, and that humans with superpowers have appeared to protect the innocent people of Earth.

The thing is, Yi Ji-Hyuk himself lived like a true, bona fide Demon King in that fantasy world, and the only reason(s) why he returned home is to find some peace and easy going life. So, what will a man like that do?

Read on and find out! Heh.