sorry for posting twice but the comment version got all messed up and looks hard to read. ^.^;
noona = older sister for men.
unie or eonni = older sister for girls.
kwenchana(yo) and anieyo are often used as your welcome.
kwenchana(yo), lit means 'okay' but in this way is like saying it's okay, your welcome.
anieyo, is like saying don't mention it, it was nothing.
hope this helps ^.^