If Moon wins, I hope he will be able to take a more sensible approach to calm things down. Since 2 decades of 'strategic patience' didn't work and threats only caused the NK leadership to accelerate their military development, a radically new approach is needed to calm things down, but that can only happen, if the 2 Koreas are left alone.
If Moon and his Kim Jong-un can sit down and talk directly, without outside (read: US) interference and cajoling, there is a good chance peace may break out on the peninsula.
Let the Koreans decide. It is THEIR country.