Koreans mainly live in the two Chinese nation states.
Studies of polymorphisms in the human Y-chromosome have so far produced evidence to suggest that the Korean people have a long history as a distinct, mostly endogamous ethnic group, with successive prehistoric waves of people moving to the peninsula and two major Y-chromosome haplogroups
 Using similar words, Koreans in China refer to themselves as Chaoxianzu (Chinese: )in Chinese or Joseonjok, Joseonsaram (Korean: , ) in Korean, which are cognates that literally mean "Joseon ethnic group"

