Hey there,
I've had an interview with Korean Horizons. They seem okay, but just a few things I wasn't confortable with. For example, the contract was in Korean and English and they were not able to provide a contract only in English. Also, I wanted to see pictures of the housing and I got some excuss that they were unable to provide any. So, I felt it was a little funny. Just my personal experience and opition.
good luck!