Level Eater - Chapter 61: Start of the Request for investigation.

Amelie Conley, the eldest daughter of a revered Alpha family, was once expected to carry on her family’s proud legacy. However, when she turned sixteen, she failed to awaken her wolf, which made her earn the scornful title—the Curse of the Conley Family.At eighteen, she found her destined mate and carried his child, believing she had finally been given a chance at happiness. But when she rushed to share the news, she found him in a compromising position with her younger sister, Flora.Betrayal cut deeper than any wound, but the final blow came when he rejected her without hesitation, declaring Flora as his true mate.Shunned and heartbroken, Amelie made the painful decision to leave her pack for the sake of her unborn child. But just as she tried to escape, she was ambushed—hunted down like prey.Desperate to protect herself and the life growing inside her, Amelie fled to save herself and her unborn child, only to collapse into the arms of an enigmatic stranger—Gabriel Sinclair.Gabriel was no ordinary man. He was the Alpha Prince, a name feared across the nation. For twelve long years, he had scoured the lands for his mate, only to find nothing. He had convinced himself that the Moon Goddess despised him, just as his own mother had. But the moment he laid eyes on Amelie, everything changed.“You were marked, weren't you?” His voice dropped, edged with something dangerously close to possession as his gaze met hers, demanding the truth. The question left Amelie in a dilemma. She didn't wish to tell him the truth.“I am not an ordinary wolf, Amelie. Who the fuck marked you before me?” Gabriel voiced in a possessive yet intimidating tone. Amelie didn’t know that the man, who saved her was none other than the infamous Dark Tyrant—the Alpha Prince, Gabriel Sinclair, whose intentions were still unknown to her.

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

There are a total of seven sins, and a revelation is made to a young man named Alex that he is destined to become a demon lord, more especially a demon lord of sin called LUST.

It's not like he can change that and because he always knew something about himself was different—not in a physical sense, well, maybe a little—and not in a mental sense—but rather because he is thrown into a demonic war that compels him to accept his new reality.

He was only aware of a difference in himself. Relating to him and the ladies who are drawn to him... Well, it was more or less like he was a magnet in front of all the girls, and all the girls were drawn to him like a metal.

A magical ring and a mighty spirit inside the ring, coupled with a genius who lost his cultivation and got named worthless trash. That’s Xiao Yan, the poor genius. You think Xiao Yan got it bad? Well, you clearly have not met Jing Yan.

Jing Yan was once the shining star of the whole East City. However, his cultivation dropped because of the Universal Ring that was left to him by his dead grandfather. Without anything but the Universal Ring, he will once more rise towards the top and beyond!

He is Jing Yan, The Universal Sword God.

- Description from Novelupdates