Once you're working there it's not much different from other asian airline jobs and better than most. The commuting works well. Don't expect the pay to change anytime soon. Down route hotels are adequate but not 5 star.
There is no Korean tax paid in respect of your salary. The only Korean tax deducted is on the per deims you are paid while in Korea which is negligible. So study the Dual Taxation Agreement your country has with Korea to avoid unpleasant surprises. Hint: the wording in the "ship or aircraft operated in international traffic" paragraph is crucial.