Samsung

Good experience for novice engineers. If you recently graduated from university, you have good opportunities to gain experience with real industry problems and challenges. Your area of expertise can grow quite fast, and you can understand the basic principles of research management. Foreign employers are usually supported with housing, and the taxes in South Korea are reasonable. Samsung is a famous brand, so experience at Samsung usually allows you to find a better job easier and can be a good step to find a good position in a different company.

Once you get your area of expertise, which is needed for your job (~1 year), further knowledge growth is quite limited. It's hard to know the working environment because of language barriers. There are lots of politics in relations (maybe the same for all big companies).

Check the quality of the R&D work more carefully. The quality should be tested and confirmed.