This article examines the similarities and differences between Korean, Chinese, and Japanese languages. It looks at the historical context of Korean language, the similarities between them in terms of grammar structure and vocabulary, as well as the distinct differences that set them apart from one another such as postpositions, particles, tones, writing systems, and verb conjugation systems. The article concludes that although there may be some overlap between these three East Asian languages they remain distinct enough for us to consider them separate entities.