Jikjinui Byeol

After a fierce battle with the Hero, the Demon King was cast into a new dimension—Earth. Humans who absorbed the Demon King’s power, which had been shattered into pieces, gained superpowers, while the Demon King dreams of retrieving that power and returning to his former world. Then one day, he encounters a human who displays magical guiding abilities… or rather, his arch-rival, the Hero, who had also fallen to Earth. To the Demon King, who declares, “If we’re going to have a decisive battle anyway, let’s have it right now,” the Hero makes a bold request: “Before that, I want to be your guide!”

(Source: Bomtoon, translated)