I thought the same thing about discounts during peak season. But, last year I booked my ticket on Jeju Air to SGN for maybe 630,000. I moved on and then asked my boss to look for a ticket for friends less than a month later. They had the K class fares!
It was the same for BKK/HKT this winter. They had the sales for the Christmas period, too! Weird, but they have them. I paid 760,000 to BKK from HKT back to ICN.
My only reason for questioning is I looked at ICN-ATL to buy my ticket home. I go home the 2 weeks before the Philippines. KE.com said that the cheapo savers were sold out a week ago...but then they reappeared yesterday.
Such a fickle game.