Analysis of information sources in references of the Wikipedia article "Songbun" in English language version.
In North Korea, one's songbun, or socio-economic and class background, is extremely important and is primarily determined at birth. People with the best songbun are descendants of the anti-Japanese guerrillas who fought with Kim Il-song, followed by people whose parents or grandparents were factory workers, laborers, or poor, small farmers in 1950. "Ranked below them in descending order are forty-seven distinct groups in what must be the most class-differentiated society in the world today." Anyone with a father, uncle, or grandfather who owned land or was a doctor, Christian minister, merchant, or lawyer has low songbun.