Belle Poupée no Spadari Konyaku: "Konomi ja Nai" to Iwareta Ningyou-hime, Gaman wo Yametara Ouji ga Deredere ni Natta. Jitsu ni Ui!

Nicknamed "Belle Poupee"--the Beautiful Doll--duke's daughter Lady Leticia is admired for her elegance and delicate beauty. But behind her porcelain mask lies her true self: a bold and compassionate soul, more knight than damsel. She ends up engaged to the infamous second prince, Gilbert, whose cursed crimson eyes and icy demeanor have made him the subject of troubling rumors. Fate binds together an infallible Princess Charming and a lonely, awkward prince as they search for their happily ever after in this ultimate role-reversal love story.

(Source: MangaPlaza)