the hall of worthies participated in various scholarly endeavors, one of which was compiling the hunminjeongeum. hangul was personally created by sejong the great, and revealed by him in 1443. afterward, king sejong wrote the preface to the hunminjeongeum, explaining the origin and purpose of hangul and providing brief examples and explanations, and then tasked the hall of worthies to write detailed examples and explanations. the head of the hall of worthies, jeong in-ji, was responsible for compiling the hunminjeongeum. the hunminjeongeum was published and promulgated to the public in 1446.