Trying to hit some of the hard places first.
You need both sets. Some things are counted in one, some in the other. Confusingly, when counting time, hours are counted in native Korean, and minutes are counted in Sino-Korean! over 8 years ago
돈을 좀 돌려주세요. [don chom dolyo juseyo.] over 8 years ago
Open your own bank account when you get your registration card from Immigration. All bank offices (but not all machines) can do money transfers, but they can be expensive. You'll have no problems buying anything you need anywhere in Seoul, except deodorant, which is hard to find outside of foreign shops. about 8 years ago