Pros
Reddal provides a much more horizontal culture compared to any other Korean company I have experienced (directly or second-hand). While it may be close to impossible to raise your voice and be heard to the CEO level, both within Reddal and with facing the clients for junior employees in most other companies, this is everyday practice in this company. As a type-A achiever with a strong opinion, this has been a great opportunity for me to build a name for myself with various global clients already from a very junior position.
Also it's worth to mention that Reddal provides a level of global exposure that is unprecedented in other firms.
Also the business model is different from traditional business consulting, which actually seems to be working better and is on the rise (while other firms apparently are suffering greatly from decreased demand).
Cons
The Korean office is still quite young and processes are not written in stone yet. If you don't speak out on something that seems not to make sense, nobody is there to look after you. Don't expect to have employee benefits handed to you on a silver platter.
Also the company mission is all about providing cost-efficient service to clients. This means that employees miss out on a large amount of fringe benefits (like luxurious dinners, business class plane rides, and all that jazz) that the conventional "business consultant" would have.