The education system in the world was simple: there were teachers and apprentice specializing in all kinds of fields, including manufacture, agriculture, mining and adventure (or hunting). When a person served a year's apprenticeship under a certain collar, he could join the production. In general, most villagers obtained permits in two or three areas when they were 18 years old. Manufacture, agriculture, and mining were relatively safe for people, but hunting was much more dangerous so it had a different education system and there were only a few qualified candidates to be a hunter. After working as a apprentice for a year, people who determined to work as a hunter were asked to survive independently in the wild for a month, carrying only basic tools. If they came back safely, they would be recognized as a professional hunter since then. Another way to be a hunter was to make a great contribution to himself or to the village. The character was qualified to be a hunter because he independently killed a bear and provided the village with oil supply with the bear. Before being a hunter, the character was a apprentice of a engineer so he was able to manufacture a gun or a bow by himself.