A sudden marriage to her first love the duke?!

Charlotte, the oldest daughter of a count, has continued to be head over heels with Leo, her first love, to whom she has been betrothed to since she was a child. However, he became the young master of the dukedom that holds the most influence in the country, they suddenly had a major difference in position... Also, due to the burn on her back she sustained due to her cruel stepmother, she's given up on her love with Leo as well as marriage entirely and now lives quietly alone. However, one day, her stepmother brings talk of an engagement to her. The man is much older and is known to be a womanizer, but it's to be a strategic marriage that will help Charlotte's family business expand... This is a Cinderella story featuring ten years of undying adoration between an unlucky, injured young woman and a possessive duke who's her childhood friend!