If you think North Korea’s dictators are bad for the world, just imagine what it’s like to be a Christian there. Anyone who knows anything about world missions and the global church knows about the Christians of South Korea. According to the Operation World prayer guide, “From the first Protestant church planted in 1884, South Korea now has possibly 50,000 Protestant congregations,” and 15 million Christians of all kinds. It’s also a missionary powerhouse, currently sending more than 21,000 missionaries to about 175 countries. Amazing! But the Christians of North Korea? They’re virtually invisible—though of course not in the eyes...