Who Is The Protagonist In 'Kill Joy' And What'S Their Backstory?

I’m the heroine in an erotic story. My specialty? Turning anything hot or cold into something steamy. On the first day I landed in a horror game, the boss told everyone to choose how they wanted to die. I smiled and said, “I’ll take shortness of breath, trembling legs, glazed eyes, and… pleasure so intense I die from it.” Boss: “???”

Behind the pretty smile and polished heels, lies a woman with blood on her hands and vengeance in her heart. Twelve years ago, she watched his family destroy hers, she survived, she trained and returned. With new names, forged identities and a single mission; Bring them all down. The plan was simple: get close, destroy him and walk away. But Leonardo Moretti is nothing she expected, underneath his brutal exterior is a man scarred by the same monster she vowed to kill. What happens when the man she comes to ruin ends up saving her?

I'm the fake heiress of a wealthy family. The system has given me three conquest targets to choose. As long as the affection score belonging to any of them becomes full, I can change my predestined death at the age of 23. But I've completely failed in my mission. The conquest targets have fallen for the true heiress, Evelyn Swanson, who has reunited with the family at the age of 18. As long as Evelyn says something, they can easily aim their malice and hatred at me. That's why I choose to take my own life in advance. Strangely enough, everyone is filled with remorse after I die.

Reina Carlo was forged by the Stingers, a shadowy organization that raised her to be a weapon. Her memories of a family—a mother’s face or a father’s embrace—were long lost, replaced by the harsh discipline and ruthless training of her surrogate family. To her, the Stingers were everything, until betrayal shattered the fragile foundation of her loyalty. Now, Reina walks the streets as the hunter, her mission deeply personal. A man who dared to strip away her last shred of innocence must face the consequences. Her scars are tools, her training a guide, and by sunrise, her vengeance will be complete. But each kill leaves a stain on her soul, no matter how she rationalizes it. She tells herself the trade is fair: she removes monsters, and the world lets her survive another day. Redemption and forgiveness don’t belong in her world—they are luxuries for those unbroken by life. Yet the nightmares persist, whispering of a stolen past and a family that might still exist. Did they abandon her, or did they think her lost? These thoughts claw at her resolve, forcing her to confront a truth she can’t bury: forgetting isn’t the same as letting go. Her pact with Marco Alessandro—a powerful, calculating man—only adds to her turmoil. Their marriage of convenience grants her the resources to find her family and avenge her past. But Marco’s unrelenting gaze and quiet intensity break through her defenses, challenging the walls she’s built. As vengeance, love, and identity collide, Reina faces a choice: cling to the darkness she knows or risk everything for a future she can’t predict. In this world of shadows and betrayal, Reina Carlo fights not just to survive—but to discover who she truly is.

Introduction：Xienne Collins, a typical college student, is beautiful and smart. Known for being kind but being abused by her classmates whom she considered friends. Her character was trampled on. Not a day goes by that she is not begrudged and bullied by them. She endured it for too long and told herself she would not retaliate or will take vengeance. But the day came when she was filled with what her classmates were doing. She wanted to kill them all and planned carefully how she could accomplish this. She killed her classmates one by one. She writes in her diary what she did to her classmates for satisfaction about what she had done to them. Little did she know someone is watching her.

After being reincarnated as the villain in a story where everyone doted on the heroine, the system appeared. It told me that if I could win over any one of the male leads, I would regain a healthy body and return to my original world. But I failed to win over any of them. There was my adoptive brother, the fake heir, who grew up with me. My rebellious high school deskmate, the real heir, who became a boxer. And my childhood sweetheart, the genius surgeon. Even my own son, whom I carried for ten months. Without exception, they all fell in love with that cold, stubborn damsel while growing to deeply despise me. The system sighed and told me that if I could die at the hands of any one of the male leads, I would be able to see my parents in the original world. In the end, I used every method possible and was finally killed by them, with their own hands. But why did they all go mad afterward?