Heatherfate, a person who bears hatred towards the royal family, has one mission: infiltrate the fortress of the Fourth Prince, Thorian, and destroy him. Trained by the King himself, she believes Thorian is a monster wielding a dark power—the Forceheart Sphere—a device hidden within his chest that allows him to create powerful machines to defend his isolated castle.But when Heatherfate finally encounters Thorian, he isn’t the ruthless villain she expected. Calm, strangely kind, and with a deep sadness in his eyes, Thorian’s behavior shakes her certainty. Haunted by this encounter, Heatherfate retreats to her hidden lab to question her purpose, realizing the mission may be far more complicated than she ever imagined.With secrets of the kingdom starting to unravel around her, Heatherfate is left wondering: who is truly the villain, and can she trust what she's been taught?