From the book nothing to envy. What caused Chang-bo to get into trouble with the Ministry for the Protection of State Security?

The correct answer to this open question is the following.

Although there are no options attached, we can say the following.

What caused Chang-bo to get into trouble with the Ministry for the Protection of State Security was the fact that he realized some injustices and he felt he had the right to express his opinions and emotions although these could annoy other people and the system. That is why he questioned that if they were producing so many boots, why was the reason that he could not afford any boots for his children. That upset the Ministry for the Protection of State Security.

The story of "Nothing to Envy: Ordinary Lives in North Korea," was written by author Barbara Demich, and resulted from research she did and the interviews to people who could escape from the North Korean dictatorship.