Since ancient times, Koreans have had an inherent language different from Chinese, but the lack of the inherent language has brought a lot of inconvenience to the written life. Therefore, for a long time, South Korea had to borrow Han Chinese characters from China, but it was often unable to express its meaning (for example, the artistic conception of Tang poetry and Song poetry was difficult to express in English). Considering this reality, King Sejong of the Korean period created scientific, original Korean characters around 1446, which is worth showing off by the world. Since then, the Korean people have been using their own writing and language completely different from that of the Han people in China. Therefore, Koreans have become one of the only nations in the world who think in their own language.
As for the cultural loss in the time of blending with Chinese characters, it is also great. I believe that more knowledgeable Koreans will learn Chinese in depth in the future to make up for this historical regret.