HC Design Library is situated in 600-years old historical residential area of Seoul. In Korean traditional houses, a study(library) is a central space, which is connected with a courtyard in daily life. We think that a library is the space where people become sensitive to light, sound and to even a scent during they read books. The library considers shadows made from bottom surfaces and bookshelves where one’s eyes reach on. By inserting a small box into the existing place, we could escape from the monotony of the existing gallery space and make the familiar feeling(scale) of a study in houses. The space for readers and walls for books are created by doing so.