Well, try looking up in this forum regarding being an FO in Asia. Specially in Korea. Just sayin you should carefully gather as much info as you can before making the move.
Asiana is not know being a friendly FO airline. Captains lack of crm, they expect you to be just a subordinate and keep your mouth shut at all times.
Also consider the option of not being upgraded no matter how smooth operator you are or how many years you have been there.
Good luck anyhow