In the early Joseon Dynasty on the Korean peninsula, the rate of the Upper class(Yangban) accounted for top 4%, the Common class was 50~60%, the Lowest class was 20%~30%. The Upper minority class used classical Chinese(Hanja) which was very difficult to learn and write, but only the ruling minority class knew how to use Hanja, while most commoners were left illiterate and ignorant. The classical Chinese writing system was not suitable to express the ideas and emotions and had limits to communicate with each other, because of the complex ideograms. Hence, it was difficult to submit a written opinion to a higher court reading officially announced contents and information from the public office. And many times they were swindled out.
So, around 600 years ago, King Sejong(1397~1450), the forth king of Joseon Dynasty, and his scholars established an academic institute called Jiphyeonjeon, where they devoted themselves to studying the Korean language. When King Sejong tried to arrange an easy language which is easy to learn and write, in order to solve this sad problem of his subjects. A lot of courtiers offered a determined opposition to King because they thought if the Lower class who had been ruled by the Upper class ‘Yangban’, were able to use written language, then will become stronger then ever before and cannot be ruled. So, the Upper class had insisted the use of difficult letters ‘Hanja’ because they don’t want to lose their vested rights and supremacy. So, a large percentage of ordinary people were ruled out for hundreds of years because just don’t know the letters ‘Hanja’. Finally, Hunminjeongeum which is Korean script manual was invented and published in 1443.
Let me give you a similar example of a different context.
In 1887, a Poland eye doctor, Lazarus Ludwig Zamenhof(1859~1917) lived in Bialystok in Poland, There was a social problem. Polish, Russian, Jewish, and Germans were lived together. However, due to differences in language they could not understand each other’s positions, there was a lot of conflict. In order to create a world where they could coexist peacefully without any conflicts, He created the easiest and simplest language in the world,