Hangul Day is observed in North Korea on January 15 each year, commemorating the invention and proclamation of the Korean alphabet. This day marks the announcement of the newly created alphabet by King Sejong the Great in 1446, originally celebrated on November 4, but later adjusted to October 9 based on historical findings. While South Korea celebrates Hangul Day on October 9, North Korea honors it on January 15, believed to be the actual date of the creation of Hunmin Jeongeum, the document introducing the alphabet. The holiday is also known as Gagyanal, a name derived from an early colloquial term for Hangul. In 1928, the name was officially changed to Hangullal, which is widely accepted today. This cultural observance highlights the significance of the Korean alphabet in North Korean society.