I'm the Mysterious Leader of the Salvation Organization - Chapter 511:

Eons have passed since the prophesied godslayer met his demise. Yet, in a world reborn, whispers stir of his return, of a new man born from the remnants of an ancient prophecy.Kallen, destined to master the delicate balance between chaos and order, light and darkness, emerges to defy the very fabric of fate.Existence is a tapestry, one whole, connected, and indivisible. It is woven by the fabric of fate, spun with the strings of karma, and stitched with the threads of causality.Yet, within this unity lies individuality, and this individuality is the essence of existence. The manifestation of essence is Will.But what is a sparked Will against one akin to a raging inferno? What is a child before a mammoth? The conviction of a mortal before the boundless Will of cosmic beings?The answer is defiance!.A defiant Will, is what Kallen needs to liberate himself from the suppression every mortal endures from apex lifeforms. To live his life free, unhinged and on his own terms.But it takes a bit of crazy to be brave, and Insanity to be defiant.This is the story of a mortal breaking limits to achieve Apexification, to walk with his head held high and free in every corner of the universe.It is the irony of a slave who holds the reins, even as their chains bite deep. It is the cry of a heart bound in servitude, yet refusing to surrender its essence.

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

I just left an honest review, and I was reincarnated. But not into the novel I criticized—into the world of [SSS-Class National Power Heir] .I reincarnated as Baek Seo-jun, the older brother of the original protagonist, faced discrimination, and was discarded as a sacrifice.And then I experienced hell.With the power of the final boss, I will exact revenge on everyone—whether it’s the original protagonist or the villains.[The protagonist who has gained the power of the final boss]

He was the youngest guru of martial arts as well as the perfect Mr. McDreamy of the most girls. He had mysterious absolute touch, clear-sighted observation ability and various outstanding talents.