My Cherry Will Explode in the Apocalypse - Chapter 38

In a world fractured by conflict and haunted by shadows of the past, Kokushibo—the first Upper Moon demon—meets his end, only to awaken in a new life. Reincarnated as Crimson, a child born into a different family, he carries the memories of a past he cannot escape. Burdened by centuries of guilt yet indifferent to the present, he resigns himself to duty—until an unexpected bond with his newfound family begins to thaw his hardened heart. As he struggles between the weight of his past and the weight of the new life, Crimson must decide whether he will remain shackled to his former sins or embrace the possibility of peace.

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

Can she melt the ice in Northendell... and his heart?Arielle is the forgotten princess of the Nieverdell, a country blessed with the warm sun all year round. She was sacrificed by her family to become the prisoner of the Northendell Kingdom because of the sins of her brother, the crown prince.In the kingdom covered by eternal ice, Arielle met King Ronan D. Blackthorn, a man full of mystery.King Ronan was cursed. On a full moon, he would lose his human side and turn into a werewolf. Weirdly enough, ever since Arielle stepped into his life, he could slowly control his animal instincts.But great power came with its own consequences. Arielle and Ronan were faced with a difficult choice:Lift his curse or lose Arielle forever.