The obvious solution is simply to hand the Islands over to the UN and make them part of the Demilitarized Zone. The only possible purpose of having bases on these islands is to be a launching point for invasions of the North Korean coast, and that is about it.
I looked at that city on that island on Google, and my estimation is that there is no way that that little Island can support a town that side through agrigculture and fishing. In other words that Island is a military base, formest, before anything else. As for the people who actually live off of the Island, I am sure they would be happy to live their without the thread of being on the front line of a continuation of the civil war.
You're estimation is wrong, the island is home to crabbers; they catch a unique crab from that area that is a Korean delicacy and can only be found it that area. They've lived on those islands for generations. It's a pretty big industry (crabbing) and you can't blame the Kroeans for building the place up when there's money to be made from the crabs.
http://en.wikipedia.org/wiki/Yeonpyeongpretty
Yeonpyeong Island is renowned for its kumouuri, a specialty spiced crab.
I see. Now we have moved from that South Koreans have every right to base military personnel on these islands and conduct live fire exercises on them to there are no military personnel on the Islands at all. Indeed, the two Korean soldiers killed and the six wounded were on vacation "crabbing" and the "civilian" construction workers were building storage coolers for captured crabs.
Gee so 8 out of 10 and probably 10 out of 10 casualties were actually military personel or doing things related to military activities during an bombardment by North Korea using highly innaccurate rocket ordinance (which you pointed to as an example of the wrecklessness of the dastardlly North Koreans), and yet, you want us to believe that the large built up area is all about the fishing industry, when it seems no crabbers of fishermen were killed.
Stalin's propagandists were good at making the facts disappear down the memory hole, and I am sure if they were alive today they could use your services.