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Seo Gyeongdeok (1489–1546) was a Korean Neo-Confucianist philosopher during the Joseon Dynasty. His philosophy studied materialism and phenomenology based on ancient taoist philosophy theories absorbed by neoconfucianism, like Yin and Yang and Ki.
|Revised Romanization||Seo Gyeongdeok|
마음이 어린 후이니 하는 일이 다 어리다
My heart is young