The Villainous Woman Who Ruined a Nation Starts Her Revenge Drama with the Cold-Blooded Duke

After her beloved older sister dies, Christina discovers that the royal family may have been involved in her death. Her sister had been a saintess and the crown prince’s fiancée, and had cared for Christina like a mother after their own mother died when Christina was young. When the sister’s engagement is abruptly ended, she is sent to an enemy nation with which the kingdom is under truce, while Christina is announced as the crown prince’s fiancée. Devastated by news of her sister’s death, Christina vows to take revenge on the royal family, using her own fiancé. She joins forces with a cold-blooded duke who also bears a grudge against the royals, beginning their revenge drama.