OP, this is one of the best TR's that I've read in a while. The pictures are amazing and the way you wrote the report, I'm very very impressed.
I've been to Jeju multiple times and I've enjoyed my stays at the HR. I wish they had a better pool like the Lotte, but the rooms are fantastic along with the club lounge. I've been to the Lotte and was underwhelmed with the service and room when comparing the hotels.
Looking forward to the rest of this TR along with any future TR's that you decide to write