Default Verizon Note 3 wont display korean characters in .epub files

I have tried 4 different ereaders, and no luck. Some display some "missing character" white boxes, some display boxes with a big X in them, and some display nothing at all, just spaces. I bought a book on the Nook store through the Nook app to help me learn korean, and was very upset to find it wouldnt show any characters.

I have a korean keyboard downloaded through the settings, so I dont know why it cant display these characters. Please help!