Pros
General benefit is good. They try to improve system for employees. There are lots of work to do, therefore you don't need to worry about getting laid off.
Cons
I have Korean background, so I can talk about the actual issues. When I was there, and I am sure it will be the same, Korean employees from HQ are the problem. HQ is sending people to help local branches every 3 or 4 years, depending on their positions, but they won't respect local culture at all. They bring all bad Korean culture to work. Remember that managers in Korea HAVE TO be respected by employees. Managers are god. They can do whatever they want, and even humiliating you in public. This is what those people have. If you have Korean background, then good luck with that. If you don't have it, you will have less opportunities to get promoted. Yes, this is who they are. They prefer bi-lingual, because they can control employees badly. These Koreans don't have critical authority for hiring decision but they still do. Those Koreans love to get involved in anything and everything. During any meetings, if you don't get interrupted by them for 5 mins, then you are super lucky. They don't give you opportunities to speak at any meeting at all. I assume that they don't trust you in general. The best part of those Koreans is they are REALLY good at criticizing. They can find what your weakness is and what you did wrong. This is super easy for them. They have Phd for that. Korean culture has good and bad, and these people introduce all bad korean culture. Actually, HQ has much better culture based on what friends say. That's why Samsung Electronics reputation is higher on glassdoor than it should be. I still recommend it because work is rationally more than okay, and you can learn a lot. If you have ability to ignore their bad etiquettes and nagging, then you can work there. Good brand name on your resume too. Otherwise, you will get stress a lot.