The interview process and training course are tough. That has been discussed to death on this website. Foreign pilots are paid a training salary and per diem while on course. Courses are running from 2 1/2 to 3 1/2 months depending on aircraft type. 777 seems to be longer with only one FFS available.
There has been some recent ideas of foreign pilots transfering types (ex: FO 737 to FO 777) as Korean needs to move senior FOs to the 737 fleet as Captain's. Also being reviewed is the current pay scales for foreign pilots with other carriers such as EK ramping up for more recruitment.
FYI
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