If you really want to work in Korea, then I would recommend you check out Yale Foreign Language Institute in Daegu, Suseong-Gu. They have three schools in Daegu. There is another Yale Language School, not part of the same group. Stick to the one in Suseong-gu. It's the best one in Korea.
Upscale neighborhood. Wages good, accommodation great. It's a big school. The only problems that arise are disputes between foreign teachers because Yale employs many of them. If you are in Korea, go in person and speak directly to either Mrs. Kim or her husband Mr. Lee. Otherwise call and speak directly to them.
If you get sick, go to the hospital with a Korean friend who can speak for you.
AND Stay away from ULSAN!!!