Well, I stick to reality, and the reality is that Koreans were offended. Regarding Japanese people, our Korean microwave engineer, probably my best friend over there, once told me while we were on a train to HQ from the boonies to Taejon, that if he saw a Japanese person on the train he would throw the man off. This was about twenty years after the war and Korean liberation from Japanese occupation, and this Korean was still fiercely resentful, with good reason. Their women were kidnapped and used as sex slaves. Even if you can prove some Neolithic connection of Han people to Mongols or Chinese, that is immaterial when considering Korean sensibilities. That's just common sense.

Koreans well know that China invaded Korea after the Japanese left, and divided their country, tearing families apart. Why should Korea like China? China and Mongolia had invaded Korea numerous times, long before Europeans had ventured across the Atlantic. The independent kingdoms in Korea predated Christianity