How does the caste system effect different characters in the book, Escape from Camp 14?

One day Shin and a group of classmates had to go to the train station to load some spilled coal. They passed by a Bowiwon compound and were pelted with large rocks. Bowiwon people were considered North Korea’s elite. A large stone caused a deep cut below Shin’s eye. Some children were knocked out. The teacher soon followed and was angry with them for not doing their work. The children who were not unconscious had to carry the unconscious ones on their backs while they worked. Bowiwon children came from families who had been sanctified by the Great Leader. They were in their rights to stone the children of sinners. Kim Il Sung created this caste system in North Korea in 1957. Out of the 23 million people in North Korea, about 100,000 were considered Bowiwon or elite.