Looking at the successful winning bids for 5* hotels in Seoul, it appears $145-$155/night is the sweet spot. I am also traveling to Seoul in October. I will be booking four rooms for my family. I plan on reserving rooms that I can cancel without penalty. Then a week before our trip, I will try using betterbidding for priceline/hotwire. If I am successful, I will cancel those held rooms for no penalty. Still haven't decided on our budget, but it looks like we can get the Renaissance for $85/night and InterContinental for $145/night plus fees. Of course, I will start out lower, but that is what you SHOULD expect to pay. I am convinced these hotels have "priceline" operating procedures. Most hotels won't put rooms available priceline until the last minute. I see Priceline as a hotel room liquidator service. They want them rented, so they will eventually become available. They just don't want to saturate the market with cheaper alternatives when they can book rooms 90 days in advance for a premium. I saw this happen locally in Bellevue (just east of Seattle). There was a four star hotel I wanted to book for a visiting guest. I started bidding five days before their arrival. Went all the way up to $140/night and was rejected for three straight days. On the night before arrival, I did one last try on priceline. Since I had been rejected numerous times/days before I started my bidding at $120, and it was accepted on my first bid. Now my guest was happy cause I found a 4 star property for cheaper than the La Quinta (2 stars) was going for. I was mad at myself cause I could have had it even cheaper, I believe...lol Long story short. Maybe as simple as the person who puts the properties into the priceline database was off for a couple days in my scenario described above. I find the later you book via priceline the better the availability/pricing. Just my 0.02 Best wishes