“Sister, will you be my substitute?” Countess Louise Recott’s life is destroyed by the words of her twin sister, Lina, who is exactly like her. As she acts as Lena’s double, Lena is praised as a “brilliant woman” and Louise is ridiculed as “incompetent” by her family and everyone around her. One day, her fiancé, the second prince Fred, unilaterally announces the end of their engagement. The one who stands by Fred’s side is Lina. Louise has had everything taken away from her by her sister. The first person to appear in front of her in ten years is Lucius, the beautiful first prince, who is said to be a “rare genius.” “This house is too small and cramped for you. Louise deserves a bigger world.” This is the story of a young man who gradually heals the heart of a girl who has had everything taken from her.