I think you twisted Tony's words or you are a little too patriotic on this point, Chopin. Confucianism is still alive and is still being seen in South Korea. If you stay in South Korea after staying in China or Japan, you'll find out South Korea keeps Confucian purity the most among the three countries. The Chinese don't take it as a social ideology because of the revolution and Confucianism in Japan had been always Japanized and too politicized. So there's strong opposition mentality in Japan.
A form of a cultural coexistence resumed, as often happens when a country is exposed to the sea and to influences from outside. In this aspect, I don't understand why you said like "Seonbae is not Chinese culture". As I'm looking into that, Tony's answer is based on facts. Armillary sphere(渾天儀), Dano(端午節), Chinese traditional medicine, these are well-preserved in Korea even though they all were actually the Chinese tradition. I know some Chinese who are extreme nationalists, consider us such a robber, but we just made a silverstone into a goldstone.
The Mongolian and the Manchu-Chinese dominated China for a few hundred years. But see how they are these days. Manchu-Chinese were overwhelmed by Chinese culture, language and the Manchu-Chinese gave up on their native language. In the end, Manchu-Chinese is considered such a dead lanugage. Also as we know, Mongolia remains as the one of the most underdeveloped countires in the world. However, Korea and Japan created their language their own way and recreated their culture with Chinese culture their own way. That's the way it should be.
I agree with you, Tony. Let's learn from each other.