Most, if not all tours, are ultimately run by the Korean International Travel Company and it will be their guides who show you around. Forget any notions of independent, adventure or solo travel, it just doesn't work that way in North Korea. Travel throughout the country is only possible as part of a guided tour. Independent travel is not permitted, you must not leave your hotel without a guide, you will not be allowed to travel on the public transport system at all, and both you and your guide will be punished if you infringe the rules. If you are not prepared to accept severe limitations on your movements and behavior, you should not go to North Korea.