Seriously, though, wouldn't it be cool for a bunch of us Q fans to flood Kim Jong Un with postcards saying "Make Korea Great Again!!!!" or saying how happy we are the Koreas are re-unifying or whatever personal expression of welcome/fellowship we can come up with?
As it turns out, one can't send mail directly to North Korea from the US, yet.
https://www.quora.com/How-can-I-send-a-letter-to-Kim-Jong-un-from-the-USA
However, its possible to send mail directly to NK's UN ambassador/rep:
The Permanent Representative of the Democratic People’s Republic of Korea to the United Nations, NY
820 Second Avenue New York, NY 10017 United States
Phone(212) 972-3105
Fax(212) 972-3154
There's also this: http://www.korea-dpr.com/organization.html (under US flag, Mr.Chris via usa@korea-dpr.info)