The concern is that South Korea will wipe North Korea off the map, not the other way around. Many electronics will work fine with a simple plug adapter. Check the labels to make sure. Some electronics (computers for example) will require you to open the case and flip a switch on the power supply tho, so just because…
If you have a laptop check out it's power brick, if it says: "INPUT: AC 100V - 240V, 50/60Hz" then all you need is an adaptor since the brick can handle the 220v at 60Hz you'll get in Korea.