Katrina, a mistreated noble girl who is treated like a servant by her stepmother and stepsister, is forced to take her stepsister's place when the family sends someone to the remote northern territory of a supposedly cursed prince.
Terrified that her deception will be discovered, Katrina travels to the prince's domain expecting cruelty and hardship. Instead, the prince—rumored to be cold and merciless—treats her with unexpected kindness and respect.
As Katrina tries to keep her true identity secret, she and the enigmatic "Ice Prince" gradually grow closer, and what begins as a forced substitute arrangement blossoms into romance.