The app’s key menu is located at the lower tab, consisting of My Shelf, My Info, Category, and Settings. After a simple procedure of registration the user can update his/her books to My Shelf. He/she can then browse or search books to borrow. After the confirmation from the book owner, the user can borrow the book and safely return it back using the communal shelf. ReadMe KAIST is an arbitrary library for KAISTIANs. The app has a potential in creating a new culture superseding the existing libraries. It is hybridization between offline book borrowing and online book purchases. This book sharing system will soon be supporting e-books as well, making communal shelves obsolete.