I bought the Ba Na Hills tour on Klook and loved it so much that I chose a Korean guide for this Marble Mountains and Linh Ung Pagoda tour as well. Our guide was a local who spoke Korean incredibly well, was very kind, and explained everything clearly and engagingly. Originally, it wasn't supposed to be a private tour for just two people, but since not enough people gathered, it ended up being just us. I think it was probably a small-group tour to begin with. We first visited the Marble Mountains, and among the five mountains, we went to Thuy Son, which was truly magnificent! However, the really disappointing thing was that we couldn't go to Am Phu Cave, the 'Hell Cave' that's constantly explained on YouTube! They say it's called the Hell Cave and has a lot to see, but I'm not sure if it's not originally part of the tour (they said it wasn't) or if it was skipped. Since there were only two of us, the tour ended a bit quickly, and we came straight to Linh Ung Pagoda… That's when I realized we hadn't gone there. Our guide said if he had mentioned it earlier, he could have taken us, but now that we'd moved on to Linh Ung Pagoda, it would be difficult to go back. ㅠㅠ If you're on a small-group tour like us, definitely ask if you can go to Am Phu Cave. Other than that, it was great! ~ But that one thing is a big regret ~ haha