Adeel, from "And With Your Help I'll Get That Chicken" has an interesting post comparing North and South Korean propaganda posters.
So go read it.
The comparison between the heavy-handed way the government talks to its people in the north, and in the south, serves to remind us both that South and North Korea aren't really that far removed, timewise, from being the same country (sixty or seventy years isn't a whole lot in geopolitical terms), and the real point of divergence might have only been as recent as 1987 or 1993, with South Korea's first democratic election, or South Korea's first election of a civilian president.
Though it's definitely different now... listen how similar the song is in this (admittedly old) North Korean tourism ad, to the music your taxi driver listens to, or to the music tracks playing in the background at a noraebang (karaoke room).
Some south Korea Trot music.
Yes, South Korean tourism advertising is better than that...
But the fact South Korea's tourism promotions have all been upstaged by some random tourist who happens to be a good video editor? Not good news.
Seriously, they should just hire this guy.
In general, I've observed that sentiment towards North Korea is mostly generational -- as South and North Korea have become less similar over time, those with less memory of times when North and South were similar feel less reason to hold onto the connections that remain. People under thirty seem to spend more time talking about the staggering economic burden North Korea would be as a province of South Korea, absorbed and needing support, while people over forty have bought into the "one people" thing comparatively more.
One of my students once dropped the interesting thesis that Western technology companies dread Korean unification, because North Korea's cheap labor combined with South Korea's technology know-how would enable South Korea's technology companies to dominate the world markets by undercutting the prices through reduced manufacturing costs.
Meanwhile, a left-leaning, Nork-friendly student I once had argued that if South and North Korea reunited, South Korea would become a nuclear capable nation, which it isn't right now, thanks to North Korea's nuke program, and that would raise Korea's status in the world. Although I suspect this might have been a prepared argument used to justify being North-friendly, as I've since heard that exact same argument, to the letter (or at least to the talking point) from a few other north-friendly people who were smart enough to know their "one blood, one people" stuff had run out of gas with anybody under forty, and perhaps they needed a different line.