I was just on the same connection time in ICN last week, barely an hour to clear security due to a bit of delay with Air China ( I was connecting with UA for the 6 pm flight). I even asked the officer at security line to let me go first as it was already boarding time for my flight. The officer would have let me cut through the line but since there were only about 6 people in front of me, she just told me I should be okay. Of course. I had to rush to my gate and made it inside the plane with the rest of the passengers while catching my breath!