Billy Graham’s 1973 crusade in Seoul, South Korea propelled the fast-industrializing nation into an era of explosive evangelical growth. Since then, the peninsular democracy, once a Buddhist stronghold, has become a hub for evangelicalism and the world’s second-largest missionary-sending nation. Still, the nation exists along the most heavily fortified border in the world, exposed to the nuclear brandishing of its northern neighbor and the pull of a profoundly atheistic working class, but it remains a stabilizing force in the region and a powerful launching point for the gospel in Asia. It is now the second only to the U.S. in sending missionaries abroad.