I got to know of atrocities done by Imperial Japan against many countries, especially Korea and China and many old folks in those two countries hate the Japanese and vice versa.
But what about Korea and China? Were they having a friendly relationship in the past? Any wars? War crimes against each other?
Sry if I made a mistake, first poster here :)
Going by colloquial definitions of the two polities, 'Korea' and 'China' have a shared history stretching back many centuries, and it would be difficult to cover it all in a single post. While other posts may be able to clarify other periods, I discuss relations between the Joseon kingdom in Korea and the Qing Empire in China in this answer.