Heaven’s Mountain—a forbidden realm ruled by the ferocious evil dragon, Krokshu. While many have set foot upon its treacherous slopes, none have ever returned alive. Into this desolate land, a lone knight stepped forward.

And yet... when he finally descended from Heaven’s Mountain, his soul had been replaced.

The man who emerged was no longer the knight, but the soul of So Gun-ak, the Second Young Lord of the Millennium Cult from the Central Plains. A man who had once wagered his very life to save his subordinates after being framed by a treacherous conspiracy.

In a world filled with the despicable "salvation" of hypocrites and the distorted "mercy" of the corrupt, the world is already no different from hell.

"Then, I shall personally become the King of the Underworld!"

Thus begins the journey of the Black Knight, destined to tear this world down and reshape it from its very foundations!