Kim Jang-saeng (July 8, 1548 - August 3, 1631) was a Neo-Confucian scholar, politician, educator, and writer of Korea's Joseon period. He was the son of Kim Gye-hui (김계휘, 金繼輝), who was the Censor-General during the reign of King Seonjo and his mother was from the Pyeongsan Shin clan (평산신씨, 平山申氏), the daughter of Shin Yeong (신영, 申瑛). He's one of the famous members of the Gwangsan Kim clan and he was put in the Confucian shrine where he was honored as a Munmyo Bae-hyang (문묘배향) sage-scholar. Thus, he became one of the 18 sages of Korea (동방 18 현).
^Jae-eun Kang The Land of Scholars: Two Thousand Years of Korean Confucianism 2006 "A pioneer of the study on family rites based on the doctrines of Zhu Xi in Joseon was Kim Jang-saeng (金長生, pen name is Sagye 沙溪, 1548-1631), who wrote Garye jimnam (家禮輯覽, Exposition of Family Rites) and belonged to the Giho ..."