Like mentioned before check the postings about Korean in the Asian subforum. Especially for non-rated guys it seems to be very tough and they fail people's checkrides from time to time.
What I heard/read about Korean is:
- Most live in a hotel near Inceon (at least for the first time of the contract?)
- Captain/FO relationship especially between Korean CPT and expat FO can be difficult
- Very strict SOPs with long briefings and minor mishaps can bring you in trouble
- Upgrades not likely to happen with contracted expats thru an agency
Without knowing your current situation I would try Turkish Airlines or Norwegian. With 3600 hrs on type I guess you have good chances to get an invitation.
Good luck!