Korean Air Skypass - Do I have enough time to transit at ICN?

Flying from ATL to Ho Chi Mhin City in Vietnam on Korean Airlines, changing planes at ICN.

The flight from Atlanta arrives at 5:05 PM.
The flight to Vietnam leaves at 6:45 PM.

Is that enough time to make it between planes?

Will I just be walking from one plane to the other or will I need to collect luggage, go through customs, re-check luggage, go through security, etc.?

Fortunately, Korea, like the rest of the world, isn't as insanely paranoid as the U.S.

Assuming your bags are checked through, you just go through security and then proceed up to the departure level to board your next flight. Should be plenty of time providing the SGN flight arrives on time (or even reasonably late).

Traveling ORD-ICN-BKK in Y next January. ORD-ICN I'm assuming will be a 747 with AVOD and power in Y. Mrs. alien and I are inclined to pick the rear doubles 53-56 BC&HJ . However, given that this will put us last off I want to make sure our connection time ICN - BKK will allow for these seats. We currently have 16:40-18:50. It's a Friday and there appear to be a number of long hauls arriving in ICN around the same time. Will last off a 747 with about 2 hours connection time be sufficient?

Will last off a 747 with about 2 hours connection time be sufficient?
Yes

Appreciate it.