North Korean defectors
One possible way is to cross the North-South Korea border through the Korean Demilitarized Zone (DMZ). However, most defectors do not take this route because it is extremely deadly. The DMZ has many landmines, tanks, electric wires, machine gun towers, and guards on both sides. In fact, North Korean soldiers have orders to kill any North Korean trying to cross the border. In some cases, South Korean soldiers have actually rescued some North Koreans crossing the border. Only 21 of the 33,000 defectors have crossed the DMZ and lived through it. Almost all of these were North Korean soldiers who had some knowledge of the DMZ.