Fair enough, I see a handful of Asian and a smattering of long-haul departures for OZ and KE in the morning, but not until 7:30 or so. Waiting around ICN between 4am and 7:30am (or longer) after having pulled an all-nighter to catch a 1am HND-ICN doesn't rank high on my list of desirable itineraries and I suspect that of many others.