Oh good point.
If you book Flexi fares. It's of course cheaper to start from ICN. I got it to fit for under 400k yen now!!!!! Now we don't have to worry about clearing US immigration and customs. Simmo can die after 3-4 days of straight flying between ICN-SIN-LHR. At least he can shower in SIN and LHR and pay for showers in ICN. No hotel nights needed..he's going to be sooooo dead!