Is Chinese also used in Korea?

Korean has been using Chinese characters since ancient times. Starting from 1948, the Korean peninsula split, and North Korea abolished Chinese characters and used alphabetic characters entirely. Although South Korea has not abolished Chinese characters, it has gradually introduced the history of relying on Chinese characters and turned to pinyin characters. Therefore, it is not surprising that their classical ancient books are all in Chinese, but the pronunciation is not Mandarin pronunciation, but equivalent to a dialect in southern China.