Localize App to Korean with NGUI

I’m trying to localize my app to Korean but don’t know what font I should be using? Is there a simplified Korean letter system I should be using? I downloaded some Korean fonts but they have hundreds of symbols. I set my iPhone keyboard to Korean and it shows a small number of symbols on the keyboard. Can someone tell me what letter system that is?

See the following link:

http://hangeul.naver.com/download.nhn

You can freely download and use the fonts even in commercial product.