Sandy, a woman with a strong personality, finds herself inexplicably transmigrated into the body of Erella, the famously kind-hearted and long-suffering heroine of the Cinderella fairytale. But this isn't the Cinderella story she knows—Erella is a 10-year-old with a mysterious heart condition, and the story seems to have taken a dark, unpredictable turn. Facing daily torment from her wicked stepmother and stepsisters, Sandy, now Erella, makes a defiant choice: she'd rather be a villainess than a pushover. What happens when a powerful, vengeful soul takes over the body of a sweet, innocent heroine? Will she find her own twisted version of a 'happily ever after,' or will her newfound powers lead her down a path far darker than any fairytale villain?

Belle, a medical student on the brink of her dreams, faces a life-altering crisis at a supermarket checkout. A 'black card' given to her by a mysterious acquaintance was supposed to be her salvation, but instead, it brands her a thief and a fraud. Just as her world threatens to collapse, the card's true owner, the enigmatic CEO Ethan DelValle, arrives. His unexpected intervention pulls Belle from the jaws of humiliation and into a life of unimaginable luxury and unspoken promises. But what are the true costs of such an extravagant rescue, and can a heart accustomed to hardship truly open to a world of endless indulgence and an intense, possessive love?