Korean is the official language of South Korea and North Korea. It is also one of the two official languages of the Yanbian Korean Autonomous Prefecture in China.any Korean dialects have basic vocabulary that is etymologically distinct from vocabulary of identical meaning in Standard Korean or other dialects, such as South Jeolla dialect /kur/ vs. Standard Korean 입 /ip/ mouth or Gyeongsang dialect /t͡ɕʌŋ.ɡu.d͡ʑi/ vs. Standard Korean /puːt͡ɕʰu/  garlic chives .