I worked at BNP Paribas Cardif Life Korea for over 5 years. The average rating about the Seoul office by the employees varies person by person. In my opinion it is totally up to you how you manage your work life. You can work like a horse and still get no recognition or you can work smart and get some recognition but get pointed at by others. However, as long as you get your job done in time, it is a good company to start a career b/c it offers you a lot to learn (literally).
The culture itself is very nice compared to other Korean culture based companies.
You will not like the raise of your salary.