Gosan Seowon was established to honor Yi Sang-jeong (pen name: Daesan, posthumous title: Mungyeong), a Neo-Confucian scholar of the 18th century. It was built in 1789 (the 13th year of King Jeongjo’s reign) through the consensus of Sarim Faction. Yi passed the state examination at the age of 25 and held various official posts, eventually being appointed Vice Minister of Public Works (Gongjo Chamui). However, he declined the position and instead inherited the academic legacy of Toegye, devoting himself to the study of Neo-Confucianism and the education of younger scholars. His registry of disciples lists as many as 273 students. In 1882 (the 19th year of King Gojong's reign), he was posthumously promoted to Minister of Personnel (Ijo Panseo), and in 1910, he was granted the posthumous title Mun Gyeong-gong. He left behind a collected works comprising 27 volumes, including writings such as Igihwipyeon, Jeyangnok, Toegye Seojeolyo, Sarye Sangbyeon Tonggo, and Byeongmyeong Balhwi. The complex is large in scale and formally structured. In particular, both ends of Angjijae and Baekseunggak feature open wooden platforms, designed to allow visitors to appreciate the surrounding scenery.
Jeonsacheong is where ritual offerings are prepared during memorial rites. Angjijae, the east dormitory, served as lodging for officiants. Baekseunggak, the west dormitory, stores the Seowon's relics. Hyangdomun, the main gate, is opened only during rites and is reserved for officials participating in the ceremony. Both ends of Angjijae and Baekseunggak feature open wooden floors, allowing visitors to enjoy views of the surrounding scenery. Stairs to the shrine are installed in three tiers on both the east and west sides of the courtyard. There are also two Jeongyodae platforms in the yard, known as "firewood stands," where torches were lit during ceremonial events.