It is written in the [[Hangul]] alphabet, which was created by [[Sejong|King Sejong]] in the 15th century to increase literacy. However, hangul wasn't formally adopted until the early 20th century. Sometimes, Korean uses Chinese characters (''hanja''), which are most commonly used in personal names and historical texts. | It is written in the [[Hangul]] alphabet, which was created by [[Sejong|King Sejong]] in the 15th century to increase literacy. However, hangul wasn't formally adopted until the early 20th century. Sometimes, Korean uses Chinese characters (''hanja''), which are most commonly used in personal names and historical texts. |