From The Great Successor: The Divinely Perfect Destiny of Brilliant Comrade Kim Jong Un, by Anna Fifield (PublicAffairs, 2019), Kindle pp. 24-25:
In 1983, Kim Jong Il made his first known foreign trip without his father, a visit to factories in emerging China. The visit, one of a handful the Dear Leader made over the years, was part of Beijing’s efforts to encourage North Korea to embark on a journey of economic transformation without democratizing, just as China had done.
“Through tireless revolutionary activities spanning over 30 years, he ushered in a new era of prosperity,” according to an official North Korean history of Kim Jong Il’s life that was published soon after he became leader.
But the reticent Kim Jong Il could hardly have been more different from his gregarious father. Kim Il Sung was lionized as a fearless guerilla fighter who led the charge against the imperialist Japanese. Kim Jong Il had next to no military experience. He was a film lover, a heavy-drinking playboy with a bouffant hairdo whose main contribution to the state was the movies he directed.
Still, in 1991, he was pronounced Supreme Commander of the Korean People’s Army. It was hardly an auspicious time to cement the succession. The Berlin Wall had come down. Just two days after his promotion, the Soviet Union collapsed. The Communist Bloc that had supported the North Korean regime, both economically and ideologically, was no more.
To bolster the case for hereditary succession in these challenging circumstances, the regime created a fantastical story about Kim Jong Il’s provenance that borrowed heavily from both Korean mythology and Christianity. He would be leader not simply because he had been appointed by his father but because he had some divine right.
His birthplace became not a guerrilla camp in Khabarovsk but Mount Paektu, the volcano on North Korea’s border with China that has legendary status in Korean culture. It is said to be the birthplace of Tangun, the mythical half-bear, half-deity father of the Korean people. The creature conferred a heavenly origin on the Korean people, and, thanks to this story, Kim Jong Il appeared to come from heaven too.
North Korea’s propagandists didn’t stop there. They said that Kim Jong Il was born in a wooden cabin and that a single bright star shone in the sky at his birth. They stopped short of making the building a manger or his mother a virgin. But, for good measure, they added a double rainbow spontaneously appearing over the mountain. The myth of the holy Paektu bloodline was created.
Kim Jong Il had been busy perpetuating that Paektu bloodline over the previous two decades. He had racked up quite a cast of wives and consorts—and children.