After I Transmigrated into a Book, I Became the Best Under Heaven

[Entering VIP on 6/21, with a substantial bonus chapter! I warmly invite all you ladies to join me for a long, slow romance!] Yu Yuxin transmigrated into a cultivation novel. After multiple playthroughs and reloads, the male lead had gone from a white-lotus saint to a psychopath who killed without blinking, tore apart the worlds of the planes, and nearly crashed the Heavenly Dao with a single slash. And she was the male lead's master, a hapless woman forced into eight hundred rounds of a tortured romance with him (mostly with her being tortured). At this point, the story was still six hundred years away from beginning. Yu Yuxin had an epiphany. "I get it! My mission is to turn the villainess's life around!" The Heavenly Dao said, "No. Your mission is to reform that jerk, make him turn over a new leaf and obey your every word, and turn him into a white-lotus saint who won't fight back when hit or talk back when insulted." Yu Yuxin cultivated for six hundred years. By the time she became the strongest person in the world, the male lead... had died in the very first chapter of the novel. To maintain the order of this world, Yu Yuxin had no choice but to disguise herself as the male lead and take his place, leveling up, face-slapping his opponents, recruiting minions, and doing good deeds everywhere she went. Along the way, she also had to turn away wave after wave of women from the original novel who threw themselves at the male lead. But the lovesick senior brother, the obsessive disciple, the arrogant rival, and the secretly passionate friend she had once rejected all sought out her male lead secret identity and demanded, "Are you having improper thoughts about your master?" Yu Yuxin: "?" "In your dreams!" the poor losers raged helplessly, furiously trash-talking her male lead alter ego. "Loser! You think you're good enough for her?" Yu Yuxin: "?" [Reader's Guide] The heroine is a true ice-cold beauty, with the highest combat power in the world. She's a dark Mary Sue who treats everyone equally and is adored by all. There is a male lead in the plot, but no male lead in the romance. Everyone has an equally unrequited crush on the heroine. Multiple playthroughs, slow burn. The blurb only covers the first playthrough. Specific content warnings are in Chapter One. Theme: Breaking free from the shackles of fate