KAL 321
A321 will arrive early next year.
Generally speaking, when the company hires foreign pilots is not looking for their knowledge or expertise.
New airplane types are always first flown by koreans, later on when the fleet is well settled, they may hire foreigners.
A380 was received during 2011, in 2016 some foreign KAL pilots had the chance to transfer to the fleet. Until 2019 no one from outside was hired.
A220 started operations during 2018, so far only korean pilots flying this aircraft type.
I guess that it will take few years for foreigners to join A321.
Regards.