On the day her father died, leaving behind nothing but enormous debt, Livia realized that she had been reincarnated as a background extra in a novel she had read before her death in her previous life. That much was fine... but then she discovered something else. She was terminally ill again — this time with the Demon Flower Disease, where black flowers bloom on the skin until death. The only way to cure it was through the heirloom of the most fearsome villainous family in this world, the Duke of Mercedes’ household. She had no choice. “I’ll just help them a little, use the heirloom to cure my illness, and then leave!” So, Livia went undercover as a live-in tutor at the Duke of Mercedes’ estate. She found the heirloom and cured her illness. Having achieved her goal, she wanted to quietly disappear like the extra she was supposed to be... but things went very wrong. “I was wrong… Don’t go. I can’t live without you, teacher.” The little boy, once known as a devilish brat, clung to her desperately. “I, who was meant to serve God and follow the Saintess… why have I come to you instead? Do you know the reason?” The holy knight, who should have followed the original heroine, swore his loyalty to her. “Miss Livia, you are the butterfly of my destiny.” The master of the empire’s greatest information guild tried to seduce her. “How about becoming the tutor of the Crown Prince instead of the young lord? I find you very desirable.” The male lead, who should have given everything to the heroine, suddenly tried to recruit her. And above all… “Try leaving if you can. If you think you can handle the consequences.” Excuse me… isn’t that a threat?! “What on earth is going on here?!” All she ever wanted was to cure her illness. But somehow, things have gone completely off track…