You can make an english media.pk2 with that
guide. Just download the KSRO source file and the PK2-Editor. If you don't know, how to use it, read the part "Updating you media.pk2 with txt files tutorial" and follow the pictures.
But even with that english media.pk2, you have to enter the korean image code. You'll have to change your keyboard settings to korean for it and pick the right korean signs. In the Log In part of this
guide, it is described, how to do it.