Open Doors USA has a World Watch List of countries where persecution of believers is severe. North Korea is at the top of that list.
Here is an article about a man who fled the country and became a Christian in China. When he learned the truth of Jesus Christ he was compelled to return to North Korea and spread the gospel there. It cost him his life by being tortured in a North Korean prison.
North Korean Killed for Spreading Gospel
Here is a man who love Christ and loved his people and wanted them to be saved.