I found an even better bookstore, and very conveniently located next to my Saturday hagwon. I spent a few hours there, bought some magazines and a philosophy book (a collection of essays by Deleuze), and a matching pair of manga books: volume one of "Deathnote" (which I learned about based on seeing a graffiti on a desk at my work), in both English and Korean translations – I've been thinking for some time that reading a manga in Korean might be a good way to work on my skills – especially having access to the English version too. Manga are very popular here (they're called Manhwa) – there are whole sections in bookstores devoted to them.