“No one must find out—I’m just a substitute…” After losing her mother, Katrina is treated like a servant by her cruel stepmother and stepsister in the count’s household. One day, her stepsister causes a scandal at a royal ball and is sentenced to train in etiquette at a remote northern territory as punishment. To protect their “precious daughter,” the family sends Katrina as a stand-in. Sent off to a freezing land ruled by a "cursed prince" known for his cold and merciless ways, Katrina prepares for the worst. But upon arrival, instead of cruelty, she’s met with unexpected kindness and warmth from the very man she feared. Can a pure-hearted substitute noble lady melt the heart of the ice prince?