Marian, who had only wanted a quiet and ordinary life, suddenly found her world turned upside down. Because of her mother's remarriage, she gained a new stepbrother, but the problem was... He's overwhelming! "I won’t let a single strand of your hair be harmed for as long as I live." "Why are you making that promise?" "If there's anything you wish for, tell me anytime." "Please don’t stay cooped up at home. Go out, meet your friends, and socialize a little. As if that weren’t enough, he even insisted on replacing the lavish carriage with a modest one, supposedly out of consideration for her dislike of attention, and spent a fortune making it happen. Is he strange? Or are all nobles this crazy? Marian had thought her mother’s remarriage was simply about her getting a new husband, and had nothing to do with her. But... can she really accept her new family?