ebook reader for Korean with dictionary lookup
I haven't had much luck either to be honest, at least not with North American products. Here's a Korean eReader:
Probably going to be a bit tough to use for non-Korean books, and I'm not sure how closed the ecosystem is on this device. In addition, since it's made for Koreans I don't know that the dictionary would show Korean > English, but you can poke around further to see what you can find.