This must be "Wizard Rock". It looks like a mad scientist's private island from some 007 movie!
"If you take a pleasure boat, it takes you close up to the lighthouse, Wizard Rock, Missing Husband Rock, Arch Island, and then you can look back at the cliffs and pine woods from the sea, where you really get a feela diffrent, artistic impression of Taejongdae." (from the official Busan Map, word for word)