Unfortunately, I did not pay attention to these reviews and worked for this school as well. Worst experience of my life. They do paint a beautiful picture, promising greatness and help at every turn.
Once you get there, you realize that the housing is the worst available, a Korean friend of mine even said that they know it to be worth 200, and not the 500 that the school says it pays.
The medical insurance takes forever to register. They say that if you need to go to a hospital, they will reimburse you later, but then don't.
Pension will never be paid.
Vacation time is rarely given for the days that you want them, even if your tickets have already been booked.
Bonuses are withheld, Housing deposit is withheld or significantly reduced.

From all of the foreign teachers I've spoken to, this is by far the worst hagwon around. The only thing harder than finding a worse school, is getting them to sign your release papers to get the hell out of this one.