One day, at the age of ten, Lucy, who was in an orphanage, was taken in by a gentleman who was a relative of her late mother. Adopted by a duke’s family, she lived with a kind uncle and his servants, and received an education as a noble young lady. She spent the next five years cultivating her education. At the age of 15, she met her brother-in-law from the estate for the first time. “I don’t accept you as my sister!” The beautiful boy shouted at Lucy, and she fell head over heels in love with his divine good looks and cold attitude. “To repay the favor, I’m going to be a great political wife!” When Lucy makes her debut in the world of socialites, she quickly becomes known as the ideal lady. She’s also the younger brother-in-law of a tsundere who can’t be honest about his feelings for his sister-in-law. This is a comedy about two people who are at odds with each other, and how they come to live a lovey-dovey life.