I Abandoned My Engagement Because of My Tragic Sister, but for Some Reason I Became Entangled With a Prince Who Has a Strong Sense of Justice

Leia, the saint of the Elshaide Kingdom, had a sister who was paranoid and behaved like a "tragedy heroine." Leia loses her fiancé who broke off the engagement after hearing that she was being bullied by her sister. After hearing those rumours, Prince Eric suggested a communal life at the royal palace to confirm the truth-?!