The guy in the front with white clothes= Noth koreas leader.
The guy with a green helmet in front of TOP= Captain KANG.
The guy in black in the back of the middle= Oh Jung-Beom
The guy in the front with a black ha was one of the students. He was the guy who was most into killing and he and "Oh Jung Beom" didn't get well together and he betraited South korea but got over to right side (Southkorea) again at the end.