https://en.wikipedia.org/wiki/Hanja
網頁Hanja (Korean: 한자; Hanja: 漢字, Korean pronunciation: [ha(ː)nt ɕa]), alternatively known as Hancha, is a Korean writing system using Chinese characters (Chinese: 漢字; pinyin: hànzì). Hanja was used as early as the Gojoseon period, the first ever Korean kingdom.