I thought this video was excellent because of just that. The subjects' reactions and the little nuances tell so much. I find it fascinating that the NKorean censors gave so much freedom to the film crew and the students, to showcase their life.
For example, I thought it was really cute to see the male and female protaganist quite close to one another. Could they be dating? Or is it all just acting?
The varied emotions seen in this documentary is a refreshing break from all the straight-face, cautious, camera-shy interviewees from the other films by foreign crews in NKorea.