Turns out, the spy was sent to Seoul with the objective of assassinating an anti-Pyongyang activist using said pens and flashlight.
The second pen can shoot a bullet filled with the same muscle paralysis-causing poison. The bullet from this pen is powerful enough to penetrate skin.
And the flashlight is basically a handgun capable of shooting three bullets.
While we're used to seeing deadly weapons pose as everyday gadgets in James Bond and Mission Impossible films, it's pretty nifty -- and scary at the same time -- knowing these types of weapons exist in real life.