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Korean nationality (Korean: 한국국적) refers to citizenship of the Korea. Korean citizen (Korean: 한국인) refers to citizen of the Korea. Korea is divided into two parts by the invasion of North Korea in 1950. The U.N. admitted (Republic of Korea) as lawful country in Korean peninsula. Nowadays, Many Koreans are living around world including America, and Japan. Especially there are two group of korean nationality. Mindan(민단), and Jochongryen(조총련). Persons of Mindan have South Korean nationality : Persons of Jochongryen have North Korean nationality, Chōsen-seki, (朝鮮籍：literally North Korean nationality）.
Most people who have Korean nationality are ethnic Koreans. South Korea and North Korea were created within months of each other in 1948, both claimed sovereignty over all of Korea. So South Korea and North Korea each regard all Koreans, north and south as their citizens. However, the South Korean government distinguishes Chōsen-seki people from other Koreans in Japan for some treatments.
Korean nationality is awarded to being born to either a Korean national father or Korean national mother (Jus sanguinis). However, In North Korea, if a child is born abroad to one North Korean citizen parent and one of mixed nationality, the citizenship is to be determined by the parents. Both Koreas adopt exceptional Jus soli, or the "right of the soil," regulation. A child born in Korea with "unknown or stateless parents" is automatically granted Korean nationality.