The Protagonist System - 10 Change Is Constant

She, a modern hidden ghost leader of an organization which gathered insane prodigies proficient in the various differing skill-sets. Highly skilled in medicine and poison, executes covert assassinations, viewed as insane and demonic in the eyes of people of the world. Killed in an accident, and reborn into the body of a disfigured young girl.

What? Face disfigured, identity stolen? A return to the family dim and hopeless? Her identity can be given up, her family can be forgone, but as for the one who harmed her predecessor who inhabited this same body, if she didn’t at least make them scream in unimaginable agony and throw them into a state of wretchedness, how could she live up to her demonic reputation? Endless turmoil ensues and it’s a battle to dominate over all! See how she shook the world dressed in a suit of red, her sword up against the dominant powers that rocked the Heavens! Her name spread across the seas, shocking the earth!

- Description from Novelupdates

There is an ugly beast that violates women in prison.

A treacherous beast that is feared and called a “Butcher”.

That’s me.

I was once a human but now I can’t even remember my own name.

I can’t speak, and I don’t understand a word they say.

It is in this deep loneliness that I am pouring my essence into the women everyday.

I pour my burning rage into them.

Over and over again, until they conceive.

From morning till night. Until the women’s souls withered.

To show them that I’m an excellent stallion and an obedient domestic animal.

But my soul has not perished yet.

I will break free from this prison soon. And when I do, it will be your last.

Every human who betrayed me, every demon who altered me, I will trample down like an ant.

And it won’t stop until I’m satisfied.

The dawn of the beast is near.

She was the world’s number one genius assassin who struck fear with just a mention of her name. Ruthless and merciless, she killed without leaving a trace. Yet she was deceived and used by the organization, and met a tragic end.

When she was reborn, she became a fat and s*upid female student.

Fat?

She stunned everyone after losing weight!

s*upid?

The president of Peking University personally came to recruit her!

Useless?

Hacker idols begged to call her goddess!

Medical giants knelt to become her minions!

Even mercenaries chased her shouting “Boss”! Math geniuses clung to her asking for solutions!

She just wanted an ordinary life, yet accidentally rose to be number one again, and gained a cunning big shot who protected and secretly pursued her.

The male and female leads fought like cats and dogs, both incredibly sly~

[Dual clean, sweet doting, face slapping, falling from grace, big shots…] [The female lead is calm, strong, a genius who acts before speaking.] [The male lead is cunning, careful, jealous, and dotes on his wife.]

No silly behavior, safe to indulge~

Vahn was an atypical youth. Due to a rare mutation, his blood had the potential to target and attack ailments within the human body. Touted as a universal cure, people had elevated his status above the norm and given him the classification "Panacea". In the media, he was hailed as a great hero who would usher in a new era or human wellness. However, behind the scenes things weren't so bright. Being a unique individual, Vahn spent his entire youth locked up in a lab with various scientists and research teams using his body and blood to perform endless amounts of experiments. The only solace in his suffering was the various anime and manga made available to him between experiments. He often imagined himself as the protagonist in a world of his own, finally in control of his own destiny. For years he nurtured this desire, until at the age of 14 he died when an organization had tried to kidnap him from the lab...