Seo Yu-gu
Seo Yu-gu (Korean: 서유구; Hanja: 徐有榘; 1764–1845) was a Korean Neo-Confucian scholar, agricultural administrator and encyclopedist in the Korean Joseon Dynasty. His pen name was Pungseok (풍석, 楓石, meaning Maple Stone), and his posthumous name Mun-gan (문간; 文簡). He came from the Daegu Seo clan (대구 서씨; 大丘徐氏). He was born at Jangdan, Paju, Gyeonggi-do in 1764. At that time, the practical science called Silhak(실학; 實學) was prevalent among the Joseon intellectuals, but unfortunately, it was rarely adopted by the Royal Court.