I appreciate the flight date of the OP is long gone. However, I'm currently in the process of arranging an STPC & this is the info I received, which may help others:

" As our HQ employs a couple of hotels, we do not know which hotel passengers will be stayed exactly.
As informed, you will be able to get the voucher at Incheon airport.
Although not guaranteed, the stopover hotel is likely to be one of the options below:

• Howard Johnson by Wyndham Incheon Airport
• Best Western Premier, Inchoen Airport Hotel "