The Prince Betrayed Me... I Married the Emperor!

Luna spent her family's fortune putting the third prince, Leo, on the throne, because he had promised to marry her. On the day of his coronation he accused her of treason and had her executed. He had been with her half-sister Giorgia the whole time. She wakes again on the day of the bride's ball, where a woman throws an embroidered ball to pick a husband. Remembering everything, she does not throw it to Leo. It lands on a beggar named Jason, who is the emperor traveling in disguise. At the wedding Leo and Giorgia hurry to pay court to the new empress without knowing who is under the veil.