Na Sin-geol's letter to his wife, written in the 15th century (CHA)The oldest extant all-Hangeul letter has been designated as a treasure, the Cultural Heritage Administration announced Thursday.The two-page letter with almost no margins, written by Na Sin-geol (1461-1524), a Joseon period military officer, was discovered in 2011 at the burial site of Na's wife Shin Chang-meng in Yuseong-gu, Daejeon.The letter is thought to have been written in the 15th century, when Na served as a junior officer in Hamgyeong Province, which is now part of North Korea.

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