Two decades ago, millions of North Koreans faced widespread famine, and many families would do just about anything to feed their children. In an edited excerpt from his memoir, Joseph Kim describes life during the famine — and one haunting consequence of his hunger.

Born and raised in Seoul, Suki Kim posed as an English teacher at an all-male university in Pyongyang run by evangelical Christians; she spent six months teaching the 19-year-old sons of North Korea’s ruling class. In this excerpt from her book, she describes the experience.