Yi I

A pioneering Korean Neo-Confucian philosopher who reshaped East Asian intellectual history.

Yi I (1536–1584), also known by his pen name Yulgok, is celebrated as one of Korea's most influential thinkers. His synthesis of Confucianism, Buddhism, and Taoism into a cohesive ethical system revolutionized Joseon Dynasty scholarship. Unlike his contemporaries, Yulgok emphasized practical learning (Sirhak), advocating for reforms in education, governance, and social welfare.

His seminal work, Dongho Mundap, proposed land redistribution to reduce inequality—a radical idea in 16th-century Korea. Yulgok also designed fortifications against Japanese invasions, later proven critical during the Imjin War. His legacy endures through South Korea's 1,000-Won bill, which features his portrait, symbolizing his lasting impact on Korean identity.