I love this little gem of a quote "A 37% increase would be equivalent to $41,000 -- which is around the average salary of a normal employee in Korea and the request is unacceptable.".
This isn't an "average" job with average skill sets. If it was, they wouldn't need expats there to do it. They would just have the locals fly for them. Time to pay up or send cadet "We Tu Lo" of to flight training for $100k. Good luck operating your airline while it takes another 1 1/2 years to get a cadet trained, typed and line trained. It will be faster and cheaper to just shut up and pay the market rate for pilots.