Nobody, except for the starving North Koreans and some of the less enlightened people in the south want Korean Reunification.
What is much more likely is Trump getting the Norks to officially end the war and agree to make the current border permanent. But he's also as likely or more so to just get strung along by the Pilsbury Dictator.
Its extremely likely Kimmy is only playing nice with Trump to wring concessions from China.
China does not want a reunified Korea; North Korea is a welcome buffer state, and gives them an opportunity to play Good Cop.
The US does not want a reunified Korea, as within 10-20 years Korea would start focusing on their own interests, likely send most of the US presence there packing, and the US would lose a valuable strategic counter weight to China (in short: China could probably take out Okinawa, and they could probably neutralize our forces in SK, but they would likely be unable to accomplish both).
The South Korean Government wants a Reunification PROCESS to feather their cap (and for a crazy dictator to stop pointing howitzers at their capital), but they don't want reunification. The Norks are bunch of brainwashed exceptional individuals with rotting infrastructure; The highest quality things in the country were built by Soviet Russia, so have a nice long hard ponder on what that means. South Korea's population is about 50 million, North Korea is 25 million. So after reunification, your country is now 1/3 malnourished xenophobic exceptional individuals who've had some of the worst media care. It would just completely destroy SK economically for likely decades after, not including the political chaos that would result.
And the North Korean government and military most definitely don't want reunification because even if they somehow find an Obama-level cuck for negotions who will bend over and give them full immunity from the crimes against humanity they commit on a daily basis, and they somehow aren't just murdered by the people they oppressed, they sure as hell aren't going to be voted into office or enjoy the same power they have now.
This also doesn't count the vast, VAST psychological and probable physical harm that the North Korean people would suffer. The Soviets had at least been walking back their more oppressive policies before the wheels fully came off and it was still a shock to people to suddenly have choices in life.
Norks would not only be going from Zero to Freedom, but they would quickly discover everything they had been make to believe about the world outside of North Korea was a complete fabrication. Food and alcohol would be cheap and plentiful, and they would be unprepared for the amount of illegal drugs suddenly on offer.
