university period, the modern university period, and the contemporary university period. The ancient university period was from 1398 to 1894. During this period, traditional Korean Confucianism education was practiced, and institutional operation was also ancient. The ancient university period can be divided into three periods as follows. The first period is the period of establishment, from 1398 to 1494, that is, from the establishment of Sungkyunkwan during the reign of King Taejo of Joseon to the time of King Seongjong of Joseon. During this period, buildings were constructed, systems were established, and operating policies were established, and the system of the top national university was completed. The second period is the period of recession, from 1495 to 1724, that is, from Yeonsan-gun to Gyeongjong. During this period, due to the tyranny of Yeonsangun of Joseon, it was reduced to a place where Seongkyunkwan held a feast. It was only restored to its original state after King Jungjong of Joseon's accession. Also, during the reign of King Seonjo of Joseon, Seongkyunkwan was burnt down during the Japanese invasions of Korea (1592–1598), and it was rebuilt. The third period is the period of revival, from 1725 to 1894, that is, from the reign of Yeongjo of Joseon to the time of Gabo Reform. During this period, the education of Sungkyunkwan became lively amid the political and academic revival, and the theory of reformation of the education system was actively developed by Silhak scholars. Modern university period (1895~1945) The modern university period can also be roughly divided into three periods. The first period was the Enlightenment period from 1895 to 1910, that is, from the time Sungkyunkwan was founded as a modern university to Japanese annexation of Korea. In 1895, a three-year department of Chinese Classics (Korean: 경학과; Hanja: 經學科; RR:gyeonghakkwa) was established in Sungkyunkwan by the Command paper, and various courses such as history, geography, and mathematics were opened. At the same time, the professor appointment system, admission examination system, and graduation examination system were implemented, a semester system was introduced, and modern institutional reforms were carried out, such as setting the number of teaching days per year and the number of lecture hours per week. As a result, Sungkyunkwan was transformed from an ancient university to a modern university. The second period, the period of ordeal, is Korea under Japanese rule. Sungkyunkwan lost its educational function as the highest school in