Pham Hanni, entering her last year in high school, has a problem. She's not only held a name for herself as the most "invisible" person in school (she has severe talking issues), but also stuck with her lonely life style. Somehow, rumor spreads out that she's the one that the school's most popular boy (Sunoo) likes, after a stack of love letters written by him get leaked, and all of a sudden her life becomes like a Kdrama.