Edith is a lonely girl with no family, treated cruelly by her step-parents and stepsister. One day, a marriage proposal comes for her stepsister from the prestigious Grandvelle Count’s family—specifically their eldest son, Lionel. But the engagement has a hidden condition… and suddenly, Edith is chosen to take her sister’s place as the bride. Her fiancé has only one year left to live. What begins as a substitute engagement slowly turns into a heartfelt romance—can true love create a miracle in the face of fate?