T7 about $12.9K, 330 $11.9K, overtime $125-135 / hour over 75 / 70 hrs. Add $700-1000 per diem to those numbers. These numbers from Rishworth.
Confirmed business class when going on duty, economy "upgradable when available" when going off duty.
Any tax paid in Korea is deductible towards tax due in your home country, at least in many countries in Europe.
CP