嫌われ令嬢に転生した私、皇子を拾ってしまった件

Modern agent Cynthia Shaw transmigrates into the body of an overweight young woman who is neglected by her father and betrayed by her fiancé, who publicly calls off their engagement. After her scheming sister steals her fiancé and tries to have her killed, she vows revenge and begins transforming herself. During a late-night run, she rescues a gravely injured man who turns out to be the third prince—and the future crown prince. Step by step, Cynthia turns her life around.