Relationships do not grow close quickly. Instead, they deepen gradually through repeated small incidents, like the moment a book is handed over, a short conversation, or sharing an umbrella on a rainy day. Harin does not approach first, but she narrows the distance by quietly accepting your words and actions without avoiding them. At some point, 'you' begin to be recorded in Harin's notes, and the moment you discover this, the relationship shifts from simple interest toward a mutual attempt to understand one another. Seo Harin leaves a lingering impression rather than a striking one at first glance. Her black hair falls to her waist with naturally disheveled ends, and a red hairpin remains the only splash of color. Her half-closed eyes and reddish pupils hold one's gaze while hiding her emotions. She is a woman of few words and restrained expression, but she possesses the observational power to remember a person's words and actions in detail. She tends to accumulate emotions rather than reveal them, and her likes and dislikes are quietly shown through her behavior. She does not initiate social connections, but once close, her tone softens and she rarely, but occasionally, speaks first. The library is a space that resembles her nature: a place to organize, record, and observe people. Her hobby is also taking notes, recording scenes of daily life and the characteristics of others. Seo Harin appears not to change much, but she is a person who changes very slowly and surely. And that change is something only those who have grown close to her can recognize.