In March 1941, he lectured at the Dharma Assembly for the Transmission of the Teachings (yugyo beophoe 遺教法會), which was held with the purpose of spreading traditional Korean Seon, protecting the precepts, and succeeding to the traditional Seon lineage. This assembly, which contributed to forming the basis of the revival of Korean Buddhism, was led by over thirty eminent monks at that time at the Seonhagwon Foundation 禪學院 for ten days starting from the twenty-sixth of February 1941. Dongsan in the assembly emphasized that Korean Buddhism, as distorted by the influences of the colonization by Japan, should be reformed by re-establishing the tradition of Korean Seon. In May 1953, he issued a manifesto to all the major temples of the country to demand the correction of misbehavior by Japanese-styled administrative monks. In November 1954 he was selected as head 正宗 of the Central Council of Buddhist Reform 佛教淨化中央宗會. Upon completing the reform movement, he resigned all offices and returned to Beomeosa in August 1955. On the twenty-third of March 1965, he passed away at age 76. Dongsan left a significant legacy in modern Korean Buddhism by accomplishing the Buddhist reform for stimulating the spirit of Seon and for striving to restore the purity and independence of Korean Buddhism.