Invincible Immortal Cultivator in the City - Chapter 3 - 4: Cultivation is like a math professor doing kindergarten problems.

Sano Yuji, a black company employee, is summoned to another world while finishing his work at home. His profession in the other world, a Monster Tamer, is considered a job that makes it difficult to become an adventurer. However, thanks to some slimes he met, which read several magical books, he gained magical powers and the second profession, Sage. Yuji acquired overwhelming power, but is he conscious of his strength? Blindly becoming unparalleled and strongest in the world!

The invincible strongman who roams through the city by day and night, a supreme soldier king that moves across the urban landscape.

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

She, the second daughter of the Bluen consortium, a figure of envy among the rich second generation. No matter who she mentioned, they were all figures that others flocked towards. However, her boyfriend was getting married, but she was not the bride. She, who had always been so noble and lofty, was cruelly abandoned.He, the CEO of Valence Group, the intimidating young master of the Horne family and a prime example of the rich second generation. Little did people know, his bride ran away on the day he planned to register for marriage. He too, was cruelly abandoned.Laughably so, He was her soon-to-be brother-in-law.Seeing her angry and lonely future brother-in-law, she suddenly jeered, “We both have been abandoned. We would make a perfect pair.”He pursed his lips in silence.The next day, he took her to the Civil Affairs Office to go through the marriage registration process, having her replace her runaway sister as his bride.(Declaration of Ownership Chapter)“Julia, I now realize that I have always loved you. Do you know that I think of you all the time? I married her just so I could have a secure footing in the company.” Her ex-boyfriend, gripping her hand, whispered this soft confession of his misguided actions in the past.Before she could react, a strong hand appeared out of nowhere, fiercely grasping her ex-boyfriend's wrist. He cried out in pain, causing a stir among the guests at the wine party.He stood by her side, one arm draped across her shoulders, gently and passionately smiling while saying, “Wife, tell him, who am I to you?”Gazing at his handsome appearance, noble aura, and two bodyguards following him, her ex-boyfriend's face quickly drained of color, as if he had just realized something.(Cherishing Her Chapter)“Young master, the young mistress said something strange today.” The housekeeper, trailing behind him, was reporting her daily activities.“What did she say?”“The young mistress said she wonders if snow flying in June would be beautiful.” The housekeeper finished his report and carefully observed his reaction. After all, how could it be possible for there to be falling snow in the scorching heat of June?Once again, he pursed his lips in silence, then silently went upstairs.The next day.As soon as she stepped out of the main house, she was stunned. The sunrise filled the high sky while the expansive courtyard was covered in white snow. It was a vast expanse of white, as if it were midwinter, and countless snowflakes were dancing in the sky. The snowstorm was of extreme beauty.