I know nothing about this school Aston nor the recruiting agency you are all discussing. What I do know is that
1. Recruiters don't get their payment till you stay a full three months at the job they hire you for.
2. A good recruiting agency will give you ALL the information you need to come to S. Korea PLUS
3. They will put you in touch with someone either going to the same place as you or who is already there - why? So you can ask a million and one questions, have a friend when you arrive and someone to help you settle in and show you the ropes. It stands to reason if you are happy you'll stay and they will get paid. If you re-sign your contract they aren't paid again but if you sign with a new school after your contract is over they are paid again.

Stay away from "cram" schools also known as "Hogwans" and "academies." It really is hit and miss whether you land in a good place or not. But if you sign with a public school you have a very legitimate contract, set hours, wages, and vacation time. You work regular hours Mon to Friday leaving your evenings and weekends free to do as you want and there is a helluva lot to do in S. Korea.

So if you really want to come to S. Korea to teach try World English Services. The person who runs it has actually lived and taught in Korea herself so has some legitimate experience. She has almost 25 of us in the city of Yangsan and we are only one of the cities she supplies. I receive nothing for promoting her services but no one here has ever complained about her and her company.

best of luck

Fiona