Overall, its a very smooth process from the moment you get off the plane until you hit the outside air. Dont forget to grab the little rectangular foreigner cards inside the plane! I wrote “CEO” for my job and they didnt care 😂 Im sure most people are exhausted and just want to get to their hotel already, but there are just a few more hours to go, so be ready for that. I really wish Incheon was just a little closer to Seoul, but oh well. As always, ask me any questions!