Because Hangul is one of the few writing systems where both the founder and the founding date are known, the day is also dedicated to commemorating the achievements of King Sejong.

To assuage this problem, King Sejong created the unique alphabet known as Hangul to promote literacy among the common people.

However, Hangul had a resurgence in the 19th century, and gradually grew more and more common, especially due to its role in Korean nationalism during the era of Japanese occupation.

In 1926, the Korean Language Society, whose goal was to preserve the Korean language during a time of rapid forced Japanization,[10] celebrated the octosexigesimal (68th) anniversary of the declaration of hangeul on the last day of the ninth month of the lunar calendar, which is on November 4 of the Gregorian calendar.

The name came from "Gagyageul" (가갸글), an early colloquial name for hangeul, based on a mnemonic recitation beginning "gagya geogyeo..." (가갸거겨).

Major employers pressured the South Korean government to increase the country's annual number of work days.

[11][12] In 2009, a heavy bronze statue of King Sejong was revealed to the public Sejongno, Gwanghwamun Plaza in central Seoul, South Korea.

Inside the museum there are many exhibits explaining the creation of the alphabet and technological advancements made during King Sejong's reign.