Hey, I currently work in Boseong so hopefully I can offer some insight.
About the town - it is beautiful, but it is small. I've never been to Hampyeong but I hear they are similar. It's a little over an hour to get to Gwangju from here. You can also get to Suncheon in an hour and Yeosu in an hour and a half. As a plus, you can get down to a nice beach village, Yulpo, in about 10 minutes by bus. Everywhere is walkable, and there are many stores but there are definitely some things you can't get. There are currently 7 English teachers here. I'd be happy to answer any more questions if you've got them.
At which school is the position being offered?