In addition, a knowledge of the Korean language is not necessarily mandatory, but it is extremely advisable. https://herrim.net/%EC%8B%9C%EA%B8%89%EC%95%8C%EB%B0%94-%ED%9A%A8%EC%9C%A8%EC%A0%81%EC%9D%B4%EA%B3%A0-%EB%A7%A4%EB%A0%A5%EC%A0%81%EC%9D%B8-%EA%B5%AC%EC%A7%81-%EB%B0%A9%EB%B2%95/
