Seosan is also known for continuing efforts toward the unification of Buddhist doctrinal study and practice. His efforts were strongly influenced by Wonhyo, Jinul, and Gihwa. He is considered the central figure in the revival of Joseon Buddhism, and most major streams of modern Korean Seon trace their lineages back to him through one of his four main disciples: "Yu Jeong" (1544–1610); "Eongi" (1581–1644), "Taeneung" (1562–1649) and "Ilseon" (1533–1608), all four of whom were lieutenants to Seosan during the war with Japan.