I also think that words like "oppa", "omma", "ajumma", etc. don't need translation. And it is also a bit confusing when a girl says "oppa" and in translation is some name.
I like subs to be simpler (without extra explanations), because I also want to watch what happens on the screen, not only be reading subtitles. :) Subs should be accurate, but simple, in correct grammar and to not look like google translated.
