Well, if you're truly interested in North Korea and want to find out more about its history, then I highly, highly recommend that you check out this extensive documentary that you can watch for free right now:
https://youtu.be/7x5dH49s30o
It does a deep dive and is extremely well-sources, and touches on a lot of interesting aspects of Korean history. And at the same time, it's a video that the layman can understand. No overly technical terms. Believe me, you've ain't seen nothing until you watched the whole video.
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