Kami no gyakuten:The yamato hero - Chapter 45: The Birth of the Dark Guardian

Legend says, that there is a great demon, who is the human kind’s public enemy. He is the galaxy federations’ nightmare as he wanted to conquer the whole universe. On the first day, he completely took out the human fleet, plunging them into disorder. On the second day, he declared that he will wipe out the whole federation. On the third day, he declared——that the hero who shot him in their previous battle must marry him, or else, he will destroy everything.

The galaxy federation president and the council members had a long meeting after that. They decided to dispatch a soldier, Wu Xing Yun, and marries him off to the arrogant demon. Wu Xing Yun was once a hero who fought for the nebula, and henceforth, he was tasked—— for the sake human race and the universe’s peace, to eliminate mistresses, settle his matters with the mother-in-law, and fix the man’s crooked ways.

Wu Xing Yun was very perplexed when he asked his commanding officer: “Sir, why did it have to be this way?”

Commanding Officer: “Soldier, bear in mind, that this mission of yours, is for the sake of the universe and mankind’s happiness. You must hold on to your husband, and fight other mistresses! Do you have the confidence to accomplish this task?”

Wu Xing Yun, stood straight, saluted, and instinctively replied: “Sir, yes sir! I will accomplish this task!”

- Description from Novelupdates

In a world without gods, where the laws of magic are written by the mages themselves, balance is fragile, and darkness reigns. Multiple dimensions surround it, watched by beings with dark and greedy intentions. This is a magical universe, unstable, marked by constant changes, betrayals, and bloodshed. At the center of it all, an ordinary man emerges, carrying a biochip capable of deep analysis and data recording. With it, he embarks on a relentless journey of genetic enhancement, seeking to ascend beyond the limits of existence. Without divine protection, without charms to shield him or overwhelming powers, he must survive in a world where threats are ever-present, and the fight for survival is relentless. Here, the only rule is to conquer or be consumed. A dark fantasy filled with dangers, evolution, and the relentless pursuit of supremacy.

I never thought I had meaning to my life, but I guess I have a talent too.

「Get ready. The duel will begin soon.」

On the day of her marriage, Li Xiaolu was forced to watch her beloved younger sister marry her fiancé.

Betrayed by her love, her family, she was killed. However, she is reborn to three years before where it all began. She aims to take her revenge while also fulfilling her dreams at the same time.

Still one day, she falls for her sister's underhanded schemes where she meets the domineering CEO.

Zhe Han: "You dare to run away after sleeping with me?"

Li Xiaolu: "Umm... can you consider it a one night stand?"

Zhe Han: "Take responsibility."

Li Xiaolu: "What???"

Zhe Han: "Marry me.."

Li Xiaolu: "....."

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All the credit goes to the original owner.