Extra's Supremacy: Rise of the Forgotten Background Character Novel

A man receives his father's final warning against sleeping with married women moments before tragedy strikes—he is killed in a bombing by a husband who mistakenly believes he had an affair. Upon death, the protagonist transmigrates into a fantasy novel written by his best friend, a work he had previously ruined by adapting it into a game. He does not arrive as the villain or hero, but as Rael Von Ashborn, a minor background character fated to die within days for kissing the Duchess of the Empire—a married woman. Trapped in this dangerous predicament, he must choose between unlocking a powerful class or facing execution at the hands of her psychopathic husband, who possesses god-tier abilities. When the protagonist awakens the Jester Class, an apparently useless skill, his situation grows grimmer. Struggling to survive in this hostile world where even his maid is unexpectedly formidable, he must navigate the cruel irony of his predicament in this realm the author calls Extra's Supremacy.