A twenty-year-old woman who has spent her life bedridden finally passes away, only to reincarnate as Renese, the villainess of her favorite R-rated romance novel. The original story follows the heroine Aria, who has a fateful encounter with Prince Frantz, leading to a romantic relationship. Renese, as the prince's jealous fiancée, uses her loyal knight Elden in a scheme to break the couple apart, but Elden, secretly in love with Aria, ultimately betrays Renese. Having reincarnated as this doomed character, the protagonist resolves to change the narrative. Her goal is not to win the prince for herself but to ensure that Elden, her favorite character from the novel, can find happiness with Aria instead.

The world is a classic fantasy romance setting, centered on a royal court where social status and magical elements like love potions drive the plot. The protagonist Renese, now armed with knowledge of future events, plans to derail the story's key turning point: the love potion incident. In the original plot, Aria accidentally spills a love potion on Prince Frantz, solidifying their romance. Renese's plan backfires spectacularly when the potion is spilled on Elden instead. Far from falling for Aria, the enchanted Elden becomes passionately obsessed with Renese herself. This unexpected development creates the central paradox of the title, trapping Renese between her original mission to unite Elden with another woman and the knight's sudden, potion-fueled devotion to her.

The primary cast includes Renese, the reincarnated villainess who seeks to rewrite a tragic ending for her favorite character. Elden is the knight, who in the original story was destined to love Aria but is now an unknowing target of the protagonist's affection and the potion's effects. Prince Frantz and the gentle heroine Aria remain the romantic leads of the original story, around whom the reincarnation's plans initially revolve. The central conflict arises from the protagonist's struggle to manage Elden's unpredictable post-potion behavior, which threatens to completely unravel the original plot she is trying to preserve. Notable narrative arcs include the initial reincarnation and realization of her situation, the failed attempt to prevent the love potion event, and the subsequent chaos of dealing with a love-struck knight whose feelings are both magically induced and potentially real.