A romance blossoms between an exiled governess and a cold-hearted Northern Duke at the end of a bitter winter. A fallen noblewoman takes a job as a governess to earn a living, only to be exiled to the Duke's northern estate for giving her student an enlightening book. There, she meets a stern duke who rules the harsh northern lands while raising his late brother's child alone. As he puts her to the test to determine whether she is fit to tutor his nephew, he gradually finds himself drawn to her honest and upright nature. Slowly, the heart that had long been frozen like the northern winter begins to bloom with the warmth of spring.