One the same day as a North and South Korean naval boats opened fire on eachother for the first time in seven years, I hung out with a group of adorable North Korean refugee kids, who visited Seoul National University. When they realized that I don't understand much Korean, they tried to communicate using body language and talking very slowly. Very different from the South Korean ajuma-way of communicating (talking louder and faster and in a more aggressive style). Also, the CEO of the huge Korean company SK was there.
Check out an article about this in Korean newspaper Donga (in Korean).