I didn't see it in the 5 pages of this thread so please accept my apology if the following issue has been covered for flights from DPS-ICN on KE when you purchase a round the world ticket.

KE has something called economy plus seats for this route in the front cabins. It will give you seating in either an F or C cabin depending upon the equipment they are using on that day with only a Y service for those seats. If you were to buy either an F or C round the world ticket from any Skyteam partner and you have DPS-ICN as part of your itinerary, they make you sit in the Y cabin. They refuse to give you the economy plus seats that in reality are either in the F or C cabin of the Airbus 300-330. Personally I don't see the logic in this and the supervisor at KE said that the only way to obtain those economy plus seats is to purchase a separate ticket for the DPS-ICN portion of your travel.