"You need help with that?" "Oh, yes please," "Feel free to call me if you need with the high shelves, my name is Min-Su," - When Namjoon goes for a little holiday in his hometown, he disguises himself as a librarian but when he meets this girl, can he keep his secret. Will this girl know who he is or is he just an invisible person to her? Can Namjoon keep his promise to the members?