I had some very surprising last minute success after checking rates for weeks and finding nothing. I had to submit multiple claims because rooms kept disappearing (peak period...) by the time my brg was being reviewed. Also, zenhotels worked! Note that it was an instant confirmation room...

Hotel Name: Sheraton Seoul D Cube City Hotel
Arrival Date: October 2017
Departure Date: October 2017
Room Type: Deluxe Corner room with breakfast for two adults
Starwood Rate: KRW 294000
Competing Website: Agoda
Competing rate: 542.28 USD inc tax
Actual confirmed rate: 226,194.29 KRW per night, plus service charge (282,742.86 KRW less 20%)


Hotel Name: Four Points by Sheraton Seoul, Namsan
Arrival Date: October 2017
Departure Date: October 2017
Room Type: Deluxe room for two guests (room only)
Starwood Rate: KRW 184874.38
Competing Website: Zenhotels
Competing rate: 555 USD
Actual confirmed rate: 140,117.87 KRW per night, plus tax and service charge (175,147.34 KRW less 20%)