They need 747/777/787 and A330 crews. 18,000 USD a month.
The big deal, for some anyway, is that relief time counts as PIC. You will be converted if need be. In other words if you are currently on 747 they can put you on 777 or 787 at their cost. This could be good if you'd like to stay on Boeings.
Guangzhou is two hours train ride from Hong Kong.
There are base opportunities available.
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Best of luck