Migawari Reijou wo Sukutta no wa Reikoku Mujihi na Koori no Ouji no Ai deshita

身代わり令嬢を救ったのは冷酷無慈悲な氷の王子の愛でした

As the illegitimate daughter of a count and his maid, Katrina was born into miserable circumstances. And now that she's lost her mother, the treatment from her stepsister and stepmother the countess has only grown worse. One day, her stepsister receives a royal order to move to the northern outskirts due to her unseemly behavior at a recent party. There, she is to learn proper conduct under the tutelage of the resident prince, rumored to be a cruel man. Not wanting to subject her daughter to such punishment, the countess decides to send Katrina instead. Katrina arrives in the north shaking in fear. But contrary to the stories, the "merciless and cold-hearted" prince is kinder than she believed. Might the pure-hearted Katrina find love in the wintry countryside?(Source: MangaPlaza)