i have a cheat system in the apocalypse

In this world where monsters and magic exist, there are all sorts of things inexplicable with science. Lee Woo was a famous scientist in his old world until he got sent to a monster world where science doesn't exist so he will make it exist.

When the enveloping darkness ends, it is also the time when the door of light will open. However, when passing through that door, the intense red light unveils the brutality; the dawn of the apocalypse just has only one the continuous flow of fresh blood signaling an impending doom. It all started when Hubert Wang, bored with his life, decided to buy the virtual reality game “Zombie World” from a mysterious man on the street. When he opened the game, a few specific words echoed in his ears. “From now on, 36 billion people will have to fight with you... Please be ready for the battle!” Thirty-six billion people, who will be the one to bring a new ray of hope to all of humanity from the land of the dead? Can Hubert Wang redeem himself for the mistake he made?

Thenma, a poor and weak young man; worked hard for him and his little sister. They were orphanages, making them insulted and bullied. The weak Thenma would keep quiet, and his brave younger sister would always protect him. But Thenma's life was collapsed when tragedy striked his sister, and his lover gave nothing but a stab in the back. A chaotic life made Thenma think death would be better, but a mysterious and foreign system chose him to become The Next Greatest Revenger. "Count to ten of your peaceful life before I come and destroy it like a disaster. I am The Greatest Revenger!"

In a world filled with levels and mythical beasts, a prince thrives to reclaim the kingdom that was once his own and avenge the death of his father no matter what. The prince is faced with all kinds of enemies and monsters but through the help of a peasant maiden, he fights with zeal and the skills of a Japanese swordsman, he never lost his spirit and even after his kingdom was taken from him and he was left with nothing but his sword he still kept his royalty and held his head high in the face of danger and in the face of the evil king, his name is Prince Elliot Alexander the only son of Ivan Alexander the third.

With no one except his mother, Leonard has to take full advantage of his scholarship at an elite school. However, when he crosses the path of one of the wealthy heirs, he becomes an object of bullying. Beaten up to a plop, Leonard thinks his life is going to end there up until a mechanical voice rings out in his mind. “World Domination system awakened, initiating link with the host.”

Jack is a humble young man working tirelessly at a pizzeria, saving up to buy an engagement ring for his girlfriend. But his dream shatters when he discovers her betrayal and is brutally beaten by her lover. Just when he thinks he's hit rock bottom, a mysterious voice in his head reveals a secret system that rewards him with enormous sums of money for completing certain tasks. What starts as a strange opportunity soon turns him into a millionaire. Now, with unimaginable power and unlimited resources, Jack leaves his old life behind and sets his sights on a new purpose: revenge on those who humiliated him when he was poor. His ex-girlfriend, her lover, and everyone who looked down on him will feel the weight of his fortune… and his fury. But as the system demands more from him, Jack faces a disturbing question: who—or what—is behind this reward game? And, more importantly, what will be the true cost of his revenge? A story of wealth, power, and the thin line between justice and destruction.

Being the school's dumb yard and a crazy psycho, the only thing that Christopher wanted was a degree in business and a lovely life after college with the person that mattered most to him, Silver. But one Valentine's night, while he sought to get her a lovely present from his heart, she was preparing her own present. And heartfelt betrayal and sex with the school billionaire prince that gets everything that he wants, Kelly. Torn into shreds, Kelly beats him with the intention of ending his life, but instead of putting an end to him, he is revived by the Fame building, and now that he is back, he is ready to not only take over his school but also the world.

After enduring three years of marriage to an unfaithful wife, Ethan Sinclair's world shatters when he catches his wife, Maya Reynolds, in a compromising position with his boss, Tony West, a shareholder at Uber Organization. The betrayal leads to a tumultuous confrontation where Maya requests a divorce, setting the stage for a night of unexpected discoveries. In a twist of fate, Ethan learns that he is the heir to an ancestral legacy. As the divorce is finalized, Maya, consumed by regret, returns seeking forgiveness and a second chance, pleading, "I was wrong. Can you please take me back?" However, Ethan, haunted by betrayal, delivers a resolute response: "It's too late."

Born in a world where those with strong abilities ruled, Shian Smith was born in this era, in a poor family that was barely able to survive, his mother left him and his terminally ill father to be with another man because she couldn't cope with the difficulties. Shian was then trained thoroughly by his father before he passed away, and due to the constant threat of the Cythrauls, Shian trained with all his might. After the death of his father, he made a promise to himself to rise to power and become powerful enough to protect those around him, to prevent himself from facing emotional pain again. Find out how he does this as he awakens the Ancient Godkiller System which aids him in his odyssey.

Betrayed by his girlfriend and humiliated by a wealthy heir, Justin, who had come to the big city to study alone, experienced yet again the importance of money. Just as he reached the depths of despair, he heard... Super Rich System: "Master, please use money to beat her face swollen!" Super Rich System: "Master, your task is to spend ten million dollars within two hours!" ...