Young Deidelia Steinbet's life may seem grand and fabulous as the first and only daughter of the Duke and the fiancée of the crown prince of the empire. However, her life has been one of misery—never receiving love from her father, her mother (a woman she had never met), and her fiancé, who openly flirted with a young commoner, a stain on her dignity, a MERE commoner had something she supposedly did not have. She was forced into an unfair contract, well, at least unfair to her. Deidelia's sanity slowly eroded as she was mistreated by the servants. No one took her seriously; she was merely a pawn, and everyone knew it. But one day, Deidelia snapped, falling madly in love with her crown prince just to escape the crushing loneliness. Over time, she became a hazard to everyone around her, earning the title of the Demon of the empire. It happened when a lady at a gala mocked her and asked, "Aren't you the Duke's daughter? Why are you so pathetic?" That lady lost her life the same day. As if a switch had flipped, Deidelia looked at all the servants who dared mock her. Everyone her father's influence allowed to be punished learned that mocking a Duke's daughter would have severe consequences. But deep down, Deidelia was sad and unbelievably lonely, with only her darkness to keep her company.