Korean, which Koreans themselves call Korean, began with the new word "Andrew" invented by King Sejong of the Li Dynasty (1397-1450, 14 18- 1450), which was once not used. China's language and system have been used in North Korea since ancient times. The new characters invented by King Sejong have not been recognized by scholars. However, because they are easy to learn, they are widely circulated among the people. During the Li dynasty, the inferior people spoke Korean, the nobles used Chinese, and the history books of North Korea were all in Chinese! Later, the Li Dynasty perished, Korea became a Japanese colony, Korean became more popular, and later became the official language.