Re: reunification, Korea has the advantage to learn from Germany what worked and what didn't. I think the contrast is even sharper in this case, though. NK seems to be hopelessly destitute.
North Korea has no industry and the population has no education. The unification will be between a high-tech 21st century developed country and the middle ages. The first thing they will have to do is take over the schools so that the next generation in 15 years has a chance to build this country.
GDP 1990 West Germany in 1990 $24,485 East Germany in 1990 $10,430 (I'm not so sure about these figures but the direction is right)