I Was Possessed By An Unknown Manga - Chapter 204: The Class President’s Heart

Chu Yunsheng’s head hurts every time he wakes up. Because he is usually either lying in the villain’s bed, or had just gotten up from the villain’s bed.

The reason why villains are called villains is because they are extremely lethal and vengeful… and they love to blacken…

Villain: Bastard, I will castrate you!

Chu Yunsheng: …Oh.

- Description from Novelupdates

In a romance novel called “The Secret Lovers of the Academy” the male lead would often torment his fiancée–but wait, why did she cross into this world to become his fiancée, the villainess, instead of the heroine?

Louise Sweeney found the perfect solution to escape the misfortune of being the villainess: “Your Highness, I just want to tell you that we don’t have to be tied with our engagement. We weren’t even officially engaged, right?”

But what was wrong with the male lead’s reaction? To her suggestion, he replied “But our engagement wasn’t false, don’t you agree?”

Seventeen-year-old Grayson has endured a harrowing childhood, leaving him with a dark and twisted philosophy. Driven by this painful doctrine, he imposes his skewed beliefs on everyone and everything around him. His malevolent actions draw the attention of an ancient evil, an entity wrapped in darkness and legend. This being sees in Grayson the potential to carry on its legacy.As the ancient evil begins to mold Grayson for a future drenched in darkness, he finds himself drawn deeper into a web of manipulation and control. Questioning whether he has the strength to defy the fate that has been thrust upon him.Theós, an ancient deity whose origins are lost to time, rules with an iron grip, instilling fear and absolute control over those who dare challenge him.“If it is not within Theós' plan, it cannot be done!”

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?

- Description from Novelupdates