I have not stayed at this hotel but have seen it from afar during a visit to the Haedong Yonggungsa Buddhist temple. (
https://en.wikipedia.org/wiki/Haedong_Yonggungsa). This hotel is REALLY, REALLY, FAR, FAR away from anything interesting or useful in Busan. If you are staying here, you are in for some really long journeys to get anywhere useful or interesting, as there is really nothing in the area to do or see apart from the temple I just mentioned. It doesn't matter if you use public transport, or taxis, or even have your own car....either way you are looking at least 30 min travel time to get to Haeundae beach (
https://en.wikipedia.org/wiki/Haeundae_Beach), and over an hour to get to Seomyeon (the downtown shopping centre of Busan). (
https://en.wikipedia.org/wiki/Seomyeon,_Busan)
The "nearest" public transport station is OSIRIA train station and even that is quite far away. Certainly not a distance where you can walk to the hotel. OSIRIA station is a train station (not a metro station) on the Donghae train line (
https://en.wikipedia.org/wiki/Donghae_Line) so you may not find it on the usual Busan metro maps, although the train line does overlap with the metro at some stations. Apparently the hotel does have a free bus service from OSIRIA station to and from the hotel, but it isn't mentioned on the hotel website, so call the hotel for details.
The location of this hotel really seems like the kind of place a really rich and/or famous person would go if they want privacy, their own private piece of the Busan beach, and be away from everything and everyone else in Busan.
The outrageous prices seem like they cater specifically to this demographic.
I wonder how long they can stay in business with this sort of setup.