Sin System: Demonic Harem After Reincarnation

I was abandoned, humiliated, and looked down on. But after gaining the system, I’ll make everyone bow before me, no matter how impossible the system’s quests are.

Kai Wang died a loser–beaten to death in an underground fight while he watched his girlfriend kiss his killer. Kai gets a second chance at life–but it comes with a price written in blood. Granted by a mysterious system run by seven faceless beings. Now reborn with power he must fight his way back to the top while completing missions for his faceless masters. He must save his dying mother, destroy those who betray him, and become the unstoppable figure no one expected. But every mission pulls him deeper into darkness and one question remains–will he save his soul or lose it chasing power?

##"Warning: This story contains dark themes, psychological manipulation, and R-18 content. Not for the faint of heart."## Twenty years of service. A lifetime of being the shield for those who called him "trash." Kaito Kiryu was the FF-rank "failure" of the 109 summoned heroes. While the S-rankers basked in glory, Kaito spent two decades mastering the laws of matter and science to keep them alive. He was the backbone of the Hero Party—until the moment the Demon Lord fell. At the peak of victory, the "friends" he protected turned their blades on him. But that wasn't the end, regressed back to the past, to not only destroy those who betrayed him, but to protect those who loved him. But at the face of old terror new terror shows up, constant death and rebirth... Until his 4th life, this time With the power to manipulate Space, time and matter and a System that rewards the subjection of his enemies, the Architect of Ruin has arrived, to ruin the empire that once shaped him. Follow Kaito/Yasha's descent as he dismantles the empire that never made him rest.

“They only notice when you’re shining, but they never ask how long you burned to glow.” Asher Reynolds had one dream—to make music that mattered. But when the girl he sacrificed everything for betrays him with the superstar he idolized, his world shatters in front of millions. Broke, humiliated, and seconds from giving up, Asher unlocks PHEME—a mysterious ancient system that promises to turn his pain into fame. Overnight, the world falls in love with the boy they once mocked. But fame has rules. And breaking them could destroy everything. Now Asher’s rise threatens the very man who ruined him—Neil Carter, the golden boy with a dark secret and his own sinister system. Their rivalry turns into a war of gods: one powered by truth, the other by corruption. Fame made Asher a star. Vengeance might make him a legend. But at what cost? Read on to find out in this thriller!

After been killed by his cheating girlfriend's heartthrob, Donald finds himself reincarnated within the body of a weak hunter in another universe. He somehow is bestowed with a system upon his death and got transmigrated by its powers. In this apocalyptic world where monsters and demons thrive, Donald must complete every mission the system asks him to do in order to become more powerful and have his revenge on those who scorned him—even if he has to destroy the world to achieve this. And even if he has to become a villain to become more powerful, he is willing to walk that path. After all, humanity is already sunken beyond redemption. This is the purpose of the system—the Renegade System with which he awakened!

​Arlan Mahendra was born a "mistake"—an illegitimate son destined to be trampled by his elite half-brother and the ruthless Mahendra family. Beaten, bankrupt, and left to die in a rainy alleyway while his mother lies on her deathbed, Arlan screams for justice. ​The Universe answers. Not with a guardian angel, but with a cold, digital ledger. ​[System Activated: Karma Debt Collection] [Target: Julian Mahendra] [Debt Status: Unpaid. Penalty: Seizure of Lifespan and Luck.] ​Armed with a system that turns every insult, bruise, and betrayal into "Debt Points," Arlan rises from the gutter. He discovers he can forcibly collect "payments" from those who wrong him—stripping away their health, their talents, and even their remaining years of life. ​He doesn't want an apology. He doesn't want peace. He wants to audit the world. ​From stealing the vitality of arrogance billionaires to seizing the luck of corrupt geniuses, Arlan becomes the world's most terrifying creditor. ​They say revenge is a dish best served cold. For Arlan, it is simply a transaction. And everyone is about to pay up.

Caspian was a gaming genius with a bright future—until he got stuck inside one. Now, in a world where your destiny is a weapon, he’s been given a wooden stick. Mocked and hopeless, he joins the worst guild alive. But Caspian has a secret: he knows this is a game. And his joke of a weapon levels up. Twenty years ago, a god promised to return and wipe this world out. Time’s up. And the only player who knows how to win… is the guy holding a stick.

From a bullied nobody… to an unstoppable billionaire overnight. Scott Bruce was humiliated, betrayed, and killed like trash. But fate gave him a second life with a system that grants power, wealth, and dominance. Now, the same people who mocked him will watch him rise. The same woman who betrayed him will regret it. And the man who destroyed his family… Will beg for mercy.

I was born a genius numbers, logic, strategy… all of it came easy. Everything around me felt painfully plain, predictable, and boring. Even the web novels I read were the same heroes driven by emotion, not reason. Pathetic. But that all changed the night my family was slaughtered by people who weren’t even from Earth. I watched my mother’s body hit the ground. I heard my sister cry my name one last time before she was beheaded And then they said it .. “Your bloodline has to be erased.” Then came the darkness. When I opened my eyes, a glowing figure stood before me a being that called itself a remnant. It offered me a deal: a system unlike any other. The Architect System. In exchange for freeing it one day, I would gain knowledge and the power to rebuild, reshape, and destroy. I don’t know what this new world is. I don’t care about fate, destiny, or prophecies .I sure as hell don't plan to be anyone's pawn. All I know is this I will find the ones who killed my family . Hell I would even rewrite destiny if I have to . And when I’m done with them, they’ll wish they were never born.

Leonard Fincher lived at rock bottom. He worked relentlessly and sacrificed himself, yet all he ever received was humiliation and failure. Until the day he returned to the city and awakened a mysterious system: Infinite Returns: Investment Rebate System. Help someone? Receive a rebate. Make an investment? Get returns multiplied many times over. Do good deeds? The system rewards him. From a poor man with no future to someone impossible to ignore. Those who once looked down on him would soon realize one thing, Leonard Fincher was no longer someone they could reach, let alone touch.