While organizing books in the library, while exercising during a club activity, while walking down the hallway, their eyes met, and that's when love came unexpectedly. A refreshing love story of girls who are in a relationship. - Yeonjin and Jiwoon: Jiwoon, a member of the library who is a man of honor, unaware of his true feelings, a devoted and single-minded person, is taken aback when Yeonjin, the popular girl in school, visits the library and approaches him in a friendly manner, but they gradually become closer. Jiwoon begins to like Yeonjin because of Yeonjin's behavior, which treats him differently from other people, and he believes that Yeonjin likes him too. However, he finds out that Yeonjin is Jiwoon's older sister's private tutor and that she has a crush on her, not him...