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No, Stopover Provided By Carrier (STPC) doesn’t apply to award tickets.
There is a transit hotel located in T1 and T2 of Incheon Airport.
Otherwise just overnight in the lounge.
booking.com
★★★ Incheon Airport Transit Hotel Terminal 1, Incheon, South Korea
The property is located in transit area(before immigration), Incheon International Airport in Terminal1.