The nature of the changed in the course of the Joseon period. While early in the dynasty they were purely private academies, they increasingly became village institutions. New social institutions such as the
gye cooperatives, which emerged in the 19th century, often centered on the village , as did the older
hyangyak village codes. In the 20th century, many were modernized and known as "improved " (), and eventually accredited as primary schools during
Colonial Korea. This was part of a dramatic expansion of private education in this period; from 1883 to 1908, some 5,000 private schools were established in Korea. Beginning in 1918, regulations on private education became much more stringent and repressive; the number of dropped sharply. Many of the that did survive became low-level technical academies, or
ganihakgyo (). Today, seodang still operate as private academies under the name of Seodang. Their purpose is to teach Chinese character skills from beginner to intermediate and advanced levels. ==See also==