Choi Sejin (1473-1542) was a Korean linguist, educator, and a proponent of Hangul. His courtesy name was Gongseo (공서; 公瑞).
Choi devised the modern order of the Hangul letters, and assigned names to the letters. His most famous book on Hangul is the Hunmong Jahoe (훈몽자회; 訓蒙字會 "Collection of Characters for Training the Unenlightened", 1527).
Choi was an official interpreter in the Korean embassies in Beijing, so he also documented colloquial northern Chinese languages.
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