Which Asian country created Hangul under King Sejong in the 15th century?

South Korea created Hangul under King Sejong in the 15th century.

Hangul is the Korean alphabet, and its creation is traditionally associated with King Sejong the Great of the Joseon dynasty. The writing system was introduced in 1443 and publicly promulgated in 1446 through the document Hunminjeongeum, meaning “The Proper Sounds for the Instruction of the People.”

Before Hangul, educated Koreans commonly used Classical Chinese characters, which were difficult to master and poorly suited to representing Korean grammar and sounds. Hangul was designed to be systematic and relatively easy to learn, with letters arranged into syllable blocks.

North Korea also uses Hangul, although the alphabet is generally called Chosŏn'gŭl there. Thus, the historical achievement belongs to Korea as a whole, while South Korea is the requested modern country. South Korea celebrates Hangul Day on 9 October.