Time to do some google searching of Korean Air Open-Jaw Award Ticket. First link spells it out for you.

Here is a quick summary of Skyteam awards for Korean Air Skypass: All SkyTeam bookings must be round-trip, and SkyPass allows one stopover and one surface transfer at destination. (In this instance, a surface transfer is an open jaw in your destination region or in your originating region. You’re responsible for travel arrangements covering the open jaw portion of your ticket.) Two transfers are allowed on each the outbound and inbound legs of the itinerary. You can book these stopovers at no additional charge with the online booking engine, but it’s not always a smooth transaction. You need to search leg by leg, select each flight and then click the “calculate” button at the bottom of the search results.

Your stopover should be ICN on your way to HKG (destination) and the surface sector should be use HKG-PVG/SHA.