This documentary has real footage from inside north Korea, not the usual 'north Korea show' you usually see everywhere.
https://www.youtube.com/watch?v=csI1EoMOXXk
Secret footage shot by an activist inside north korea.
eg:
markets inside a north korean town https://youtu.be/csI1EoMOXXk?t=1366
dead bodies of people who tried to escape in the yalu river