Sin System: Demonic Harem After Reincarnation

Lost his parents to betrayal and his grandmother to sickness. Eagan was almost left alone in the world with no one to rely on and then he got a system that informed him about the impending doom in his world.

She betrayed him. He vanished. Now he’s back—with silence, power, and a system she never knew existed. Two years ago, Adrian Cole gave Jessica Benson everything—his name, his loyalty, and his love. She gave him lies, a divorce paper, and a broken heart… all for another man. Now, everyone believes Adrian disappeared without a trace. But the truth is darker. After a near-death betrayal, he awakened a Secret System—one that feeds on silence, pain, and precision. He returns with nothing but a quiet fire in his eyes. No explanations. No revenge plans on paper. Just missions, silent upgrades… and a heart growing colder by the day. Jessica? She’s falling apart. The man she left behind is rising—untouchable, unreadable… and more dangerous than ever. But the System knows her secrets. And Adrian’s silence may be the last sound she ever hears.

In a world where strength is the only law, Riel Draven was once the most feared warlord — until betrayal led to his brutal death at the hands of those he trusted. But instead of dying, he awakens in the body of a weak, crippled noble… 15 years before his execution. Armed with knowledge of the future and an evolving system that grants him missions, rewards, and punishments, Riel must navigate a treacherous world of power-hungry nobles, secret sects, and legendary beasts. Every decision could alter the future—or doom him to an eternal cycle of rebirth. Will Riel rewrite history and rise as an immortal sovereign, or will fate consume him once more? Power. Betrayal. Revenge. The Tyrant Returns.

Betrayed by his wife for his boss, Henry is hell bent on getting his revenge but then, he was just an ordinary man tossed by the wind of life and there was nothing that he could do. But turned out that he was wrong. At the height of his troubles, it was revealed that he was a consortium heir.

When Ethan, a long-time employee at a renowned company, was fired on charges of theft and embezzlement, his life fell apart. Intending to ask for a raise, Ethan instead received a dismissal letter. His misfortune continued when he got a call that his mother was in critical condition and then caught his girlfriend cheating with his own boss. Publicly humiliated, Ethan felt his life hit rock bottom. In his state of chaos, a meteor suddenly fell right next to him, unnoticed by anyone else. From the meteor, Ethan's phone emitted a mysterious system that allowed him to get whatever he wanted by completing missions. Each mission completed not only brought him money but also power that transformed his life.

Sardat Vettel is an errand boy for the Skull Gangster, who always has his pride trampled on. He rose from adversity after getting the Spin System. [Spin system installed! Today's Spin Prize....]

Leo was typical, overlooked and completely unprepared when a forbidden tome chose him and gave him the mark of a Warden and placed him under the Mage Academy. This school is an intermediary between worlds, a training ground where recipients of a gift of a System Interface, called a Codex, are trained. However, the file of Leo himself is empty, his Codex whispers that they are “unfinished,” and the elite at the Academy are watching him with suspicion and fear. Dropped into a realm of magical rank and fatal challenges, Leo is an exception. His magic is not dead, but a forbidden energy, which develops by consuming the magic and memories of others. In a maimed mentor who has an overabundance of knowledge, a genius competitor with a cursed lineage, and an ally with a talent to outwit the street, Leo discovers a rot inside the Academy. It is not merely teaching magic, it is harvesting it, it is tapping its students with the souls of its former students to feed its immortality, all managed by an enigmatic, manipulative Headmaster. As the boundary between the magical and the mortal realms collapses, Leo gets to know the horrifying reality of his destiny. He is a “Fractured Soul,” a descendant in an intergenerational cycle, who will either redeem the world or ruin it. In order to escape the cycle, he should learn how to overcome the same force that is eliminating his human nature and face the most outrageous truth of all: the man who has tortured him is his own father. The world has become the teacher, but Leo now has to rewrite the final lesson. Tags: Progression Fantasy, Academy Fantasy, Gaslamp Fantasy. Underdog Protagonist, Magical School, Forbidden Magic, System Interface, Conspiracy, Found Family, Cyclical Destiny, Tragic Romance.

When pharmaceutical genius Dr. Alex Chen dies in a lab explosion, he awakens in the body of Xiao Feng—the "useless" third young master of a declining cultivation family. Crippled meridians, endless humiliation, and a legacy of betrayal await him in the ruthless world of immortal cultivation. But Alex brings something no cultivator has ever possessed: modern scientific knowledge that transforms ancient alchemy into an unstoppable force. Bound to the mysterious **Revenge System**, he's compelled to settle every grudge from his host body's tormented past. Each completed mission unlocks devastating alchemical formulas and forbidden techniques. Where others see mystical pill recipes, Alex sees molecular structures. Where masters take decades to master basics, he revolutionizes millennia-old practices overnight. **"Impossible! How can a cripple create Heaven-grade pills?"** From the scheming cousin who sold him out, to the corrupt elder who murdered his friend, to the demonic lord who destroyed his family—every enemy will face his calculated wrath. But as Alex climbs from the sect's bottom to the realm's peak, he discovers the System's true purpose isn't justice. It's harvesting. Armed with explosive compounds disguised as cultivation pills, poison antidotes that shouldn't exist, and breakthrough elixirs that shatter natural limits, Alex must master both revenge and romance. The brilliant Mei Ling captures his heart, but can he trust her when everyone has hidden agendas? **In a world where strength determines everything, the strongest weapon isn't a sword—it's science.** Will Alex break free from the System's control and forge his own destiny, or will his pursuit of revenge consume everything he's fighting to protect? *Power. Revenge. Redemption. The formula for immortality has never been deadlier.*

In a world where the future is dictated by an omnipresent System, Ethan Parker finds himself at rock bottom. Once a promising tech innovator, he loses everything after a devastating scandal. With no hope in sight, he’s offered an unexpected opportunity: a second chance from the very System that governs every aspect of life.Transported back in time to his earlier self, Ethan must navigate familiar challenges, armed with knowledge of what lies ahead. As he balances between redeeming past mistakes and seizing new opportunities, he uncovers hidden truths about the System's control over society and its darker agenda.As Ethan embarks on this journey, he faces moral dilemmas and unexpected allies, including a mysterious rebel named Lila, who reveals a world beyond the System’s reach. Together, they must decide whether to conform or fight back against a seemingly all-powerful entity.

An honorable knight had just died on the battlefield, but his lost soul entered an empty body in another world. Living as the underdog Alexander, he surprises everyone with his prowess in wielding the sword relying on his combat skills from his past life. Not only his father, Baron Leville and almost everyone else in his family, but until King William VIII was impressed by Alexander. Getting so much attention in such a short and unexpected time, will definitely give some people jealousy. In fact, there are no exceptions for people who are blood relatives!