In general, the FO's are not unfriendly.
The lack of cockpit conversation as far as I'm concerned is the lack of English ability, and the lack of topics of conversation.
I find there is a general lack of curiosity in Korean society, and that leads to most Koreans knowing very little about the world, hence making intelligent conversation very difficult.
If it is just me answering a bunch of questions, I would rather have a quiet time looking for that island in the pacific Tom Hanks was stranded on...
Same goes for the cabin crew. If they were inclined to stay more than the normal 2 minutes in the cockpit, the conversation would not be very interesting.
It is what it is, nobody comes to KAL for the atmosphere, that's for sure.
At the current rate, that's my 21.46 WON.
SM