Stamps illustration:

A state civil service examination system: The Republic of Korea public service examinations are examinations held to screen applicants to the South Korean Civil Service, South Korean Foreign Service and South Korean Legal Service. The examinations were open to all Republic of Korea citizens, and the applicant need not be the holder of a degree or have any other experience; passing the exams were in themselves sufficient for recruitment; however the exams were notoriously hard.

The Tripitaka Koreana: Haeinsa is a head temple of the Jogye Order of Korean Seon Buddhism in Gayasan National Park, South Gyeongsang Province, South Korea. Haeinsa is most notable for being the home of the Tripitaka Koreana, the whole of the Buddhist Scriptures carved onto 81,350 wooden printing blocks, which it has housed since 1398.

Invention of movable metal type:Cheongju Early Printing Museum. The invention of movable metal type is regarded as a technological revolution that contributed to the civilization of humanity. It was invented during Korea's thirteenth-century Goryeo dynasty

Introduction of Neo-Confucianism scholar: Neo-Confucianism was introduced to the Korean peninsula in the late Goryeo dynasty, during the Yuan occupation.Neo-Confucian scholars believed that all beings in the universe shared an “original nature” comprising all the principles in the world.

Transmition of cotton seed:Ik-jeom Moon brought cotton seeds from China to Korea and succeeded in cultivation of cotton. This brought revolutionary changes in the clothing industry.