Pros
Management is somewhat hands-off, although the trend is moving toward more standardized curriculum and tests. Twelve teaching hours a week. Two free meals on weekdays. Standard Korean cafeteria type food. Pretty good vacation time: one mandatory camp per year, which could be as short as one week, so up to 15 weeks of vacation a year. About 12 weeks minimum.
Cons
Terrible atmosphere in the office, although you might not notice it for a few weeks, because it's not overt. There is an ongoing and apparently quite severe feud between several of the long-time foreign professors. Rather than hash it out in the open, it's more of a passive-aggressive war of attrition. Most of the people in the office try to stay neutral and be nice, but if you're nice to the wrong person, you can expect retaliation, such as being snubbed, given dirty looks, gossiped about, or most notably, receiving subtle verbal provocations in an attempt to "out" you as being on the enemy team. As a result, everyone is careful to avoid being too nice to anyone else. You'll have 5 mandatory hours per week in the office, which is one large-ish room shared by all the foreign professors. No raises.