I’ve read many books about North Korea. Most have been memoirs by North Korean defectors, but one was written by an American journalist with familial ties in South Korea. She lived in North Korea for six months with a group of Christian missionaries posing as English teachers for the children of the elite class. That one is called Without You, There is No Us: My Time with the Sons of the North Korean Elite by Suki Kim.
Others I’ve read:
A River in Darkness: One Man’s Escape from North Korea by Masaji Ishikawa
A Thousand Miles to Freedom: My Escape from North Korea by Eunsun Kim
In Order to Live: A North Korean Girl’s Journey to Freedom by Yeonmi Park
Nothing to Envy: Ordinary Lives in North Korea by Barbara Demick
Dear Leader: Poet, Spy, Escapee by Jang Jin-sung
Yeonmi Park’s story was especially hard to read because she really had to overcome a lot to escape. She’s also done a TED talk and many interviews, which you can find on YouTube if you’re interested.
IMO, there’s 0% chance King won’t be imprisoned. North Korea loves to parade around Americans for propaganda purposes. I agree there’s very little they’ll get out of it other than the pure satisfaction of making an American squirm and the potential to use him as a bargaining chip. But that doesn’t mean they won’t try to pump him for information that he doesn’t have. The amount of vitriol that is drilled into the minds of every North Korean about Americans and the United States really cannot be understated. Nothing they know about the world is remotely based in reality. Unfortunately, I can’t think of a single scenario that would result in King being treated humanely. The average North Korean isn’t even treated that way.
ETA: Corrected the amount of time Suki Kim lived in North Korea from one year to six months.