Legend of the Holy Sword

The Holy Sword is the only weapon that can defeat the Demon King... and Knight John Forkinstrong lost it. From the desolate Forgotten Fortress to the eldritch hellscape of the Super-Huge Cursed Ravine That You Can Never Leave Once You Enter, John has searched high and low for decades, but to no avail. And the only thing that continues to fuel John's unwavering willpower... is the fact that it's literally embarrassing that he lost his own forking sword.

(Source: Webtoon Entertainment)