The World's most Overpowered Side-Character - Chapter 329 The Consequences of Disobedience pt 1.

Yin BiYue has made the worst purchase ever. After transmigrating countless times into the bodies of canon fodder villains, he buys a ‘Fiend Halo’ from the Rebirth Company, supposedly the best aid for an up and coming final BOSS!

He’s ecstatic to finally get a villainous role where he won’t die after just a few lines, if any at all, and is raring to become the best opponent a protagonist will have… However, why was everyone looking at him with pitying eyes? Why was the protagonist rushing over to help him get out of his crimes? Most importantly, why was his ‘Fiend Halo’ just making things worse?!

Meanwhile, the intern salesperson at the Rebirth Company discovers that he might have accidentally sold a prototype White Lotus Halo to a certain villain…

- Description from Novelupdates

In a world where demons and elves coexist, Adam Harris awakens in a strange place, completely without control of his body. His hands are shackled, and sharp spears are pointed at him, ready to pierce him. In a state of shock and panic, he breaks free from his shackles and cries out the question, “What the devil is going on here?”

A mysterious and stunning girl, enveloped in a mystical aura, responds to his words. Her eyes glow with bright flame as she turns to Adam, demanding he surrenders. “Surrender, demon!” At that moment, Adam feels a strange warmth inside him and, glancing behind him, discovers soaring black wings. He realizes that he has now become a demon himself and is a prisoner of the elven tribe.

However, on the brink of death, when he is about to be executed, a mysterious voice rings out in his head: “Conquering Queens' system has been successfully activated!” This system offers Adam a chance at survival and the chance to become the lord of a harem where the beautiful elven queens will submit to him.

Adam's adventures begin as he plunges into an epic battle for power, love, and freedom. In this world steeped in passion and sexual intrigue, he faces dangerous adversaries and wins the hearts of beauty queens. But at every turn, he is haunted by inner demons and past secrets that could destroy everything he has grown to love and strive to achieve.

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This novel is also known as Master Fu's Mysterious Darling Wife

She is the The Young Miss of Military family Shen, her face is peerless, her temperament is cold, and she is her family’s treasure, but isn’t accepted as one’s child by her mother;

He is The Sole Heir to the top giant Fu Family, his power is unparalleled, indifferent high-born, the captain of the mysterious military force, and the youngest commander-in-chief.

Because of her grandmother’s wishes, she married him at lightning speed. She thought that it was a marriage that she needed, but she didn’t expect to be greeted with his extreme pampering.

- Description from Novelupdates

I am merely a reviewer, albeit the products I review are slightly different. For example, I review quantum computers, artificial intelligence, anti-gravity mech armor, planetary engines, sublight colonial ships, stellar detonators, etc…