※Published as a book by Futaba Shobo M Novels f and serialized as a manga in Comic Breeze. Sara, who serves as a lady-in-waiting to the princess of the Sareiyu Kingdom, is ordered by the king to take her place and marry the prince of an enemy country as part of a political marriage. Thinking it's all for the sake of the princess she admires, Sara is shocked when the princess steals her lover, and her lover insults her, calling her 'useless.' Despite being betrayed by those she trusted, Sara does not fall into despair. 'I will absolutely, absolutely be happy in Ferrie!' Goodbye, beloved princess. Goodbye, dear lover. I, Sara, will live happily as Princess Elmine with the reclusive and misanthropic prince of the neighboring country (who always wears a mask)! ※The main story is already completed. For the side stories of 'The Smile of the Princess,' please check the series list.