North Korea
Japan tried to suppress Korean traditions and culture and ran the economy primarily for its own benefit. Korean resistance groups known as Dongnipgun (Liberation Army) operated along the Sino-Korean border, fighting guerrilla warfare against Japanese forces. Some of them took part in allied action in China and parts of South East Asia. One of the guerrilla leaders was the communist Kim Il-sung, who later became the first leader of North Korea.
Kim Jong-nam
In late September 2010, his younger half-brother Kim Jong-un was made heir-apparent. Kim Jong-un was declared Supreme Leader of North Korea on 24 December 2011 after the death of Kim Jong-il. The two half-brothers had never met, because of the ancient practice of raising potential successors separately.