The Cardia family, a marquisate on the borders of the Kingdom of Shazar, possesses the power to control people’s hearts. Tiana Cardia, the eldest daughter, has been married to the young king of the neighboring Kingdom of Taratta, Lufred, for three years, living a happy life. However, her peaceful days are abruptly shattered. Lufred’s mistress, the Duke’s daughter Elsa, becomes pregnant. On top of that, Tiana is accused of being a spy, and she and her father are executed for a crime they did not commit. Just before her death, Tiana learns the cruel truth when Lufred reveals to her, “I orchestrated everything. Watching you blindly trust my every word was just too amusing!” “Did everything we shared mean nothing? Was it all a lie? Unforgivable…” The next moment, Tiana wakes up to find herself lying in a crib. Before her stands Elsa, staring at her coldly, and Lufred, who declares heartlessly, “If it’s a girl, we don’t need her. Burn her alive right here and now.” Tiana also sees her younger sister Layla, brainwashed and treated like a slave by Lufred and Elsa. Realizing she has been reincarnated as the child of Elsa and Lufred—their first princess—Tiana resolves to exact her revenge on the two of them.