Seohak was the introduction of technology, philosophy and most prominently, Catholicism and Western ideas to Joseon Korea in the 18th century. It is also occasionally referred to as Cheonjuhak () which means 'Heavenly Learning'. Literally meaning "Western learning", Seohak's antonym was Donghak (; ), which featured neo-Confucianism and other traditional ways of thought.
Seohak was seen as a western philosophy, instead of a religion, which embraced new technology. This movement was initially accepted only by a minority of progressive thinkers and even fewer people were ready to accept the Catholic aspect of Seohak.
Allegedly, in 1784 after Yi Sung-hun was baptized in Beijing, he came to Seoul and baptized Yi Byuk in the personal home of Kim Pom-u at the present site of Myeongdong Cathedral. In the spring of 1785, this location was the site of an arrest for holding a religious meeting. Although Yi Sung-hun would be released, Kim Pom-u would later be remembered as the first Catholic martyr in Korea after his initial exile and subsequent execution.
In Korea at the time only elites could read - thus the Seohak-Silhak face-off was an intra-elite disagreement.
In addition, many Korean Catholics refused to do ancestor worship due to religious conflicts. This eventually led to the Catholic Persecution of 1801.
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