Originally Posted by
lucky9876coins
Can only answer your first question. International to international connections are very simple at ICN. You simply have to show your ongoing BP/ticket and go through a simple security check which usually only takes a few minutes.
I agree. When I connected through ICN it was no big deal. It's a very nice airport, one of the nicest I've been to. The only drawback was that I had to do quite a bit of walking between gates. They do have the moving walkways though, so that helps.