The Rumored Mean Elder Sister Is Actually a Great Mage

Lynette has always been treated as the unwanted daughter of her family. Everyone calls her a "mean older sister," while her younger sister receives all the affection. Things reach their lowest point when her fiancé abandons her for her younger sister and Lynette is thrown out of her own home. But her life changes completely when she reunites with Allen, the Third Prince and her former classmate. Allen proposes to Lynette and gives her the freedom to use her magic again. She soon reveals that she possesses exceptional magical talent, something the people who looked down on her completely failed to recognize. With her newfound freedom, Lynette starts pursuing her dream of joining the Imperial Knights, while her relationship with Allen develops into a romance. It's essentially a "discarded noblewoman gets a dramatic comeback" story combined with powerful magic, romance, and a devoted prince.