Sejong the Great
Before the creation of Hangul, people in Korea (known as Joseon at the time) primarily wrote using Classical Chinese alongside phonetic writing systems based on Chinese script that predated Hangul by hundreds of years, including idu, hyangchal, gugyeol, and gakpil. However, due to the fundamental differences between the Korean and Chinese languages, and the large number of characters that needed to be learned, there was much difficulty in learning how to write using Chinese characters for the lower classes, who often lacked the privilege of education. To assuage this problem, King Sejong created the unique alphabet known as Hangul to promote literacy among the common people. His intention was to establish a cultural identity for Korea through its unique script.
Sungkyunkwan
The primary written language of Sungkyunkwan was hanja. Although hangul was invented in 1443, it did not become the primary language of study because the literary elite believed that the difficult hanja was more sophisticated. Hangul was invented to solve the widespread illiteracy of the common people at the time, but it was considered a threat by many in the upper class to their status as literary scholars, leading them to resist its implementation. As a result, hanja remained the written language used at Sungkyunkwan requiring anyone who wished to rise to the top levels of the government to be capable of reading and writing the characters.