The modern Korean writing system (hangul) is unrelated to Chinese.
Also, it's quite common for languages to be written in scripts originally developed for completely unrelated languages. Maltese is related to Arabic but written in the Latin (English) alphabet, Mongolian uses Cyrillic (Russian), Thai/Lao/Khmer derive from South Indian scripts, etc.
Also, it's quite common for languages to be written in scripts originally developed for completely unrelated languages. Maltese is related to Arabic but written in the Latin (English) alphabet, Mongolian uses Cyrillic (Russian), Thai/Lao/Khmer derive from South Indian scripts, etc.