Hwaeom is the name of the Korean transmission of the Huayan school of Chinese Buddhism. The greatest lasting impact of the Huayan school was to be seen in Korea, where it was transmitted by Uisang (hangul:의상대사 625-702), who had been, along with Fazang, a student of Zhiyan. After Uisang returned to Korea in 671, he worked vigorously toward the establishment of the Hwaeom school on Korea. In this effort, he was greatly aided by the powerful influences of his friend Wonhyo (hangul:원효대사, hanja:元曉), who although not an official representative of the school, relied deeply on Hwaeom metaphysical principles to establish his concept of interpenetrated Buddhism (通佛教).