Tiffany, raised by the Cao family, is treated as a monster because of her supernatural abilities. During an accident, she saves Gabriel with her blood, revealing herself as the long-lost daughter of his eldest son, Joseph. Before the Gu family can reunite with her, Tiffany is sold to a research institute. Rescued just in time, she returns to the Gu family, changing their fate forever. With her powers, Tiffany heals, protects, and unites the family, becoming their most treasured darling. Even powerful elites—and her Underworld-ruling grandfather—shower her with unmatched devotion.