Visiting Independant Book shop is the interesting trend in not only Seoul, but also other local areas. These are collections of bookstore that I want to go on a TOUR 
Among those stores, I recently visited ‘Customer’s taste’ (Seoul, Korea) which specialized for selling some movie-related books, and having time for watching movie together in that place as well.
Check the others in my map: [Bookstore] searching around Korea
https://www.google.com/maps/placelists/list/-qMSkvgCEGAvlbde7VZy_zj02Z5KQg?hl=ko