The Korean War has never ended, the farthest the two sides got was a negotiated cease fire in 1953. Officially and legally, a state of war still exists between the two Koreas. The border is heavily militarized on both sides, and there have been numerous incidents over the years. South Korea has repeatedly destroyed tunnels under construction from the north, some of which were massive railway tunnels for the movement of tanks and heavy equipment.
The cease fire has held pretty well, but there has never been a treaty of peace of any kind between North and South Korea. The links below detail the current state of affairs between the Koreas.
The Korean War ended on July 27, 1953. This was the year I was born so I remember it.
The Korean War, in actuality, has never ended. Although a ceasefire was signed in 1953, no official peace treaty was concluded between the two sides.