The war didn't really end, it just stopped. There was no permanent peace deal or treaty, both sides agreed to a cease fire, one that has now been in place for almost 57 years. The lasting impact this has is that both countries have to invest heavily in their militaries to guard the border against the possibility of another war. The DMZ, or Demilitarized Zone is a two mile wide stretch of territory between both countries that is both one of the most heavily mined and heavily patrolled pieces of land on Earth.
The US has had to maintain a permenent military presence there, and recently, it was admitted that for a time, we have kept nuclear weapons there as well, something that did not go over well with the South Korean public.
North Korea has never recovered from the war, and so much of its budget today goes towards military spending that the country is largely without power, adequate food or energy supplies.