Career
Bak was also diplomat and ambassador, representing Joseon interests in the Tongsinsa to the Ashikaga shogunate in Japan. The birth and death dates of Bak Seo-saeng are unknown. In 1401, He passed gwageo, the state examination, with a low grade.
In 1407, He passed high grade examination and served for the government as the Jeongeon (정언, 正言), and became Byeongjo Jwarang, the next year.
In 1419, He was appointed Jipui (집의, 執義), and he was promoted as Daesaseong (대사성, 大司成) in 1426. King Sejong the Great sent a diplomatic mission to Japan (Joseon Tongsinsa) in 1428.
This embassy to court of Ashikaga Yoshinori was led by Pak Seo-saeng. Its purpose was to respond to a message sent to the Joseon court by the Japanese shogun.
In 1430, He was appointed Jiphyeonjeon bujehak (집현전부제학, 集賢殿副提學).
Soon after that, He became Gongjo chamui and Byeongjo chamui (참의, 參議), minister of Yukjo, the Six Ministries. In 1432, He was appointed the administrator of Andong. After his death, Pak Seo-saeng was enshrined in the Gucheon Seowon in Uiseong, North Gyeongsang.
Pak"s writings are preserved in the Yaeun-eonhaengnok (야은언행록, 冶隱言行錄).
