It's Actually Not Easy Wanting to be a Supporting Male Lead - Chapter 14 part5

A 30-year-old NEET is reincarnated into the body of an otaku that choked to death on instant noodles. As he comes to grips with his new life, he realizes that this world is subtly different from Earth. The denizens of this world are far better looking, and this new world also possesses futuristic technology as well as mysterious Yin Yang masters!

What the hell is this? What the hell happened here?

[Mature Content: NO RAPE]Let’s make a deal!“Two months, if we can survive each other in the period of two months, I will marry you without objection!”…Twenty-two-year-old Evelyn Darkwood never imagined that going to her late father’s will-reading would have resulted in a rivalry between her and her siblings. That they would become a danger to her—one who sought after her life. She never thought that her life would take such a twisted turn so quickly. And what’s worse, she comes to find out that she’d been betrothed to a man she didn’t know and had never met. Zayne Mancini.The wealthiest man. A man whose power and fame were no joke. A man who possibly could be the only one capable of protecting her. Strong, cold, frightening, all this he was and despite the danger written all over him, Evelyn felt a strange connection, hot and burning. Zayne Mancini wanted her—his betrothed (a human who was his mate) and he was going to make her his, no matter how stubborn she wanted to be about it. Fascinating, thrilling, all this she was to him—like a spark to ignite his boring life. Evelyn Darkwood was a whole package that he was slowly going to bring undone. A woman he wouldn’t think twice of burning the world for. A woman he would give his whole being to. All she had to say was,“I do”

On his coming-of-age day, Argolaith’s mistake bound him to a mystical magic unseen in the world. As his powers grow, they threaten to reshape the realm—but can he master them before they bring ruin?