Ilhwa, the Young Master of the Blood Demon's sect, follows the orders of her master, the Blood Demon, to destroy the Namgung clan. However, just as she is about to die from the Blood Demon's betrayal, she hears a shocking truth: "Now, in all the world, you are the only Namgung left." Ilhwa realizes that she was actually Seolhwa, a child of the Namgung clan lost long ago, and that she had been raised as a pawn in the wicked Blood Demon's plot. After her tragic death, Ilhwa—no, Namgung Seolhwa—regresses to her thirteen-year-old self. Realizing she has been given a chance to change the future, she takes her first steps to prevent the destruction of her family. Can Seolhwa save the Namgung clan from the Blood Demon and succeed in her revenge?