This building is one of my favorite places in Seoul! As an avid reader, I can find a rich amount of books in English (as well as other languages). They have a whole floor dedicated to international reading materials. In addition, they also have another floor for multimedia use: photocopier, computer access w/ internet, etc.. and a huge bunch of DVDs available to check out. All you need is a library card to get these free! There’s a wide selection of Hollywood movies, Kids’ Cartoons, and TV Series on DVD (worth a look if you don’t have Netflix).
Finally, make sure to stop by in winter to experience the outdoor ice rink right at the library plaza. It’s only $1 for entrance, and another $1 for skate rental. What have you got to lose?