Korean Seon (禪) master of the late Goryeo period, known in Korean as Naong Hyegeun 懶翁慧勤. Disciple of 指空 (Dhyānabhadra) and chief preceptor (王師) to the Goryeo king Gongmin 恭愍王. A major figure in late-Goryeo Buddhism; his line was continued by Muhak Jacho 無學自超 (1327–1405), preceptor to the founder of the Joseon dynasty.