In 1446, King Sejong announced Korean alphabet '한글'
Here is Why King Sejong invented 한글
Our language is different from Chinese, and the two countries' characters do not match. For this reason, my foolish people want to write something, but they could not easily write it with Chinese character. I have pitied my people, and I made 28 letters. I wish all my people would easily learn these new letters and make their lives more convenient.