How come China gravitated towards being referred to as Zhongguo over dynasty names, while the Korean dynasty name of Joseon (and later Great Han) survive to this day as names for the Korean nation? Furthermore, is there a way that Chinese nation-state could be referred to by a dynasty name instead of as Zhongguo? Also, what accounts for Korea not having a name for the Korean nation independent of dynasty name, like the Vietnamese or Japanese (or indeed, China)?