I was told ‘die instead of her

"Die Instead of Her!'these were the words declared to her by her own father. Cheryl, the count's daughter who had been oppressed by her family, became the sacrifice. By royal decree, her adorable younger sister was arranged to marry the cruel frontier duke. However, Cheryl was ordered to take her sister's place and marry him, only to be killed by monsters on the way to keep the plan hidden! I believed that if I worked hard, I'd be loved someday.' While despairing, Cheryl resolved to accept her fate. But in the forest, she is saved by a red-haired young manher soon-to-be husband, the ruthless frontier duke!? A thrilling Cinderella story of a hated noblewoman's dramatic turnaround begins!"