Yi Hwang, also known as Toegye, was a prominent Korean Confucian scholar during the 16th century. He is best known for his contributions to Korean philosophy and education, particularly in the development of Neo-Confucianism. Yi Hwang emphasized the importance of moral integrity and self-cultivation, influencing many scholars and students in Korea. Yi Hwang's most significant work is the Ten Diagrams on Sage Learning, which outlines his philosophical ideas and teachings. He founded the Toegye School, which became a major center for Confucian thought in Korea. His legacy continues to impact Korean culture and education today.