Working in a Korean company is a pretty different experience.
First thing which needs to be said that there is quite a signifficant difference between getting things done at work and staying overtime. Koreans at my workplace did not get paid extra hours nevertheless at 8 pm when I was about to leave the office, nearly 70% of the staff were still at their computers. With huge feeling of guilt I was leaving the office every evening. Of course co-workers say "Go home, you're off now" but as you learn ... Koreans say one thing but think differently. True, they stay late ... but that doesn't mean they get more things done.
Another rule is that your boss is always right and you have to obey. Whether it's decisions where to purchase goods or strategic decisions whether we drink soju or beer, the boss is always right. I guess there wouldn't be a problem with this, but I had this feeling Koreans lack this individual input of their own into the daily office life.
Orders are orders ... hehe we did voluntary work. And here is how it was communicated: "Next Wednesday you will go to Yongin and will do voluntary work". Ummm ok, but where is that voluntary part?
Other than that, my general observation was that a Korean company such as SK is like a family. It takes care of you, provides you food, friends and entertainment but demands you to give up your independence. Not sure if it's really a great way.