Jeong Yak-yong's elder brother who, exiled to Heuksando in the Catholic Persecution of 1801, surveyed its sea life in the Jasan eobo
Through Yi Byeok, Yi Seung-hun and others he took up Western learning and Catholicism. Exiled to Heuksando in the Catholic Persecution of 1801, he never returned and died in exile. In the Jasan eobo he recorded the names, forms and habits of the fish, shellfish and seaweeds of the Heuksando waters from his own observation.
Queen Jeongsun banned Catholicism and had Yi Seung-hun and about a hundred believers executed; Jeong Yak-yong and his brother were exiled.
Dramatized works (films, dramas, novels) may differ from the historical record.
Twenty-third king of Joseon, whose reign under in-law clan rule saw the Hong Gyeong-nae rebellion
Silhak scholar who helped design Hwaseong; exiled to Gangjin, where he wrote the Mongmin simseo
First Korean baptized a Catholic, in Beijing in 1784; he founded the first Korean Catholic community and was executed in 1801