Vivi, a baron’s daughter from the deep countryside, is sent to the royal capital to preserve her family’s reputation. Considered plain and “rustic,” she works as a seamstress and is nicknamed the “potato noblewoman.” By chance, she encounters Alec, the Commander of the Holy Knights. To her shock, Alec falls in love with her at first sight and begins to dote on her obsessively. The two start living together, but Vivi, unaccustomed to romance, struggles to keep up with his intense affection. Why is Alec so taken with Vivi? And what secrets lie behind his devotion? A Cinderella-like romance begins, where a plain rural noblewoman becomes the center of a duke’s unwavering love.