As a quiet, unloved genius, I'm enjoying a carefree life in the frontier - I'm supposed to be a contract wife on the verge of divorce, but my husband seems to be acting strangely… Matilda, a baron's daughter, supports her family's struggling finances while caring for her frail younger sister. Although she dreams of freedom, her selfish parents constantly exploit her, leaving her with little control over her own life. One day at a soirée, Matilda unexpectedly joins a dramatic reading and performs the role flawlessly. This catches the eye of Curtis, a young margrave, who promptly offers her a contract marriage. "Grant me your talent—be my wife in name, and I will grant your wish in return." Matilda begins her new life in the frontier as Curtis’s contract wife for the next four years. While enjoying her long-desired freedom, she also learns of the local issues troubling the territory. Using the practical skills she honed at home, she swiftly solves problem after problem, contributing to the land’s development and gradually earning the love of its people as their margravine. Meanwhile, Curtis finds himself increasingly affected by the sight of his wife—unfaltering, capable, and quietly devoted despite her cold reception… A slow-burn sweet romance between a hardworking, unassuming genius and a love-clueless margrave! Original Web Serialization

https://mechacomic.jp/books/265090

Once you succumb, it's already over一an anthology about good, earnest girls being bewitched by flirtatious, seductive women.