South Korea gave Kim Jong Un a blueprint for developing North Korea
The USB drive contained a blueprint for economic cooperation between the Koreas which detailed a series of proposals for railway lines that would connect the country to China, Russia, and as far as Europe. Though Moon most likely wants to use the map to entice North Korea to keep to the Panmunjom Declaration the two leaders signed at the demilitarized zone, it could have dire consequences for the Kim family.
North Korea fiercely controls the media and imprisons an estimated 100,000 of its citizens in camps that have been called worse than Auschwitz, a Nazi German death camp. North Koreans can be imprisoned or killed for having South Korean media, which is often smuggled into the country on USB drives or small SD cards. In fact, the practice of smuggling outside media into North Korea by putting an SD card up your nose has become so common they have a name: "Nose cards." If North Korea goes through with denuclearization, declares peace with South Korea, and opens itself up economically to the world, the North Korean people will likely prosper, but the Kim regime may meet a bitter end.
While Kim seeks a promise from the US that its military will not invade North Korea after his proposed denuclearization, according to Yun Sun, a North Korea expert at the Stimson Center, if North Korea opens up to the world, the US won't need to invade. While the US may not invade, it may "try to use color revolution," or promote democracy among the people until they organize in support, and then find ways to support that organization.
In the case of reunification and denuclearization, North Korea would also be exposed to its prosperous southern neighbor, which is one of the most advanced, connected, and productive democracies in the world. Millions of North Koreans could gain access to a world of outside information. North Korean propaganda advances ridiculous, unscientific histories, which likely wouldn't hold up to scrutiny or exposure to outside information. Importantly, the citizens may find out that hundreds of thousands of their own friends and families had died, been tortured, and abused at the hands of Kim, who does not hold power temporariliy or democratically.
"I don't think the North Korean regime is prepared for that," said Sun, who went on to question how sincere North Korea could be about opening up the country knowing the dangers of an informational revolution. Often in color revolutions against violent dictators, the ruler whose grip loosens comes to a violent end.