If I Don't Play the Villain, My Mission Will Fail

[Blurb]

The villain's performer holds a rose in one hand and a blade in the other.

With blood and bone, love and betrayal, Sang Bai forged a path of Heaven's Will for the chosen one.

But after completing the mission perfectly, Sang Bai was told that the chosen one had fallen to darkness, causing the small world to collapse. Forced to return to that world, Sang Bai's villain mission became a villain-and-world-saving mission.

Sang Bai: "..."

World One: [Xianxia]

{This world was heavily revised to pass review, and the content has changed beyond recognition. There are lots of potentially upsetting elements. Before reading, check the comments for warnings. I also added an explanation in the author's note for Chapter 5, which you can read too. I still recommend skipping this one. Thank you.}

Fox-turned-immortal, arrogant and unrestrained master top x ruthless to others and even harsher to himself, male-oriented-novel protagonist, immortal venerable disciple bottom

"The blade of one who cuts himself never hurts."

World Two: [ABO Interstellar]

Alluring, scheming villain omega top x cool, handsome, universally adored alpha bottom who falls to darkness later

"Sang Bai, if someone loved you wholeheartedly and without reservation, remained faithful to you until death, and followed you everywhere, what... would you do?"

The white-haired young man smiled faintly. "I would pity him."

World Three: [Apocalyptic Superpowers]

Sickly, dark-moonlight mastermind and researcher top vs. conflicted, yandere, powerful bottom, a human weapon and experimental subject

"Sir, all you ever gave me were wounds, nothing but wounds. They are the only thing I miss."

"I'm your blade, your gun, your weapon. Sir, please don't abandon your plaything."

World Four: [Ancient Times]

Flamboyant, spoiled, willful young man who failed to usurp the throne top vs. patient, restrained, overbearing emperor with a distinctly fatherly air bottom

"You have to love me with everything you have. No matter what I do wrong, no matter how grave my crimes are, or I'll wither and die. So I order you to forgive me."

The emperor, whose name struck terror throughout the dynasty, sighed. Half helpless, half doting, he kissed the young man's cheek. "All right. I forgive you."

[Important]

* Love and hate each other in equal measure; the bottom is a split personality; happy ending in the present-day world.

* The first world has the top suffer physical abuse, and the bottom suffer emotional and physical abuse!! Proceed with caution, proceed with caution!!! The bottom is truly insane in the first world!! The later worlds are sweet and satisfying!

* Alluring, universally adored beauty top x obsessive, possessive, powerful bottom

Theme: Live for yourself