Park Gyu-su

Pak Kyusu was a scholar-bureaucrat, teacher, politician, and a diplomat of the Joseon period. He was known as a pioneer of the enlightenment group. Pak Kyusu was the grandson of Pak Chiwŏn, the great Silhak scholar. He was also known by the names of Hwanjae, Hwanjae, Hŏnjae, and Hwanjaegŏsa.