I'm kinda curious, does the author have an ultra nationalist view? not accusing or anything, just curious... being outright dismissive or overly prideful, there's a middle ground in there somewhere....
if you think of it, them Koreans distinctly differentiating themselves from south or north is kinda funny in a way....
nationalism does unify a country, but separate humans as a whole, same as all other denomination like race, religion, etc I guess in the end...