We fly into ICN on June 2 at 2:20pm. We need a flight after 5 from GMP. Everything is sold out. We're on a waitlist with Korean Airlines for 2 flights; the others are closed for waitlisting. I also tried abandoning our HKG-ICN flight and seeing if we could find something after 9am from HKG. Nope. then I tried flying on June 3. Again, nothing is available. I have flights in and out of the country and hotels for each night I had no idea there was a national holiday that made internal flights challenging. But there you are and there I am. I looked at the ferry from Jeju to Pusan (where we head next) but found the 12 hour time daunting.