Oh....I know.....read these books!
Escape from North Korea: The Untold Story of Asia's Underground Railroad
Escape from Camp 14: One Man's Remarkable Odyssey from North Korea to Freedom in the West
The Aquariums of Pyongyang: Ten Years in the North Korean Gulag
Escaping North Korea: Defiance and Hope in the World's Most Repressive Country
and last, but not the least:
The Reluctant Communist: My Desertion, Court-Martial, and Forty-Year Imprisonment in North Korea