Fiona, after a fainting spell, regains her memories of a past life and realizes she's been reborn as the villainous lady in a game. Excited by the prospect of wealth and avoiding punishment, she soon discovers a major issue: she's incredibly sickly! Unable to live the leisurely life she'd envisioned, Fiona strives to improve her health, but this world's lack of understanding about illness makes it difficult. Her efforts, however, unexpectedly change her relationship with her fiancé, Louis, a duke's son and a character from the game who was originally hostile towards her. He becomes overly protective and doting, leading to a sweet and comedic love story. This is a story of a sickly villainous lady's struggle for health and the unexpected love that blossoms.