You know, I was scanning the list of winners of past WKC matches, and I was quite surprised that Koreans didn't really take to kumdo/kendo until the late 70s/early 80s. I know they started to really invest in it in the 90's. Anyway, as the art becomes more widespread, I hope such silliness with national anthems and flags not being shown disappears. Kumdo as a distinct style of kendo is an intriguing concept, isn't it?