I made the reservation too late, so I ended up booking a course without a Korean guide. Since it is a course included in the diving, they gathered everyone together before the dive and gave us a detailed explanation, warning of danger, and directions for responding in case of danger. I was very satisfied with the scuba diving experience along with the snorkeling, and the second snorkeling was changed to fun diving (licensed), and I was the only one who chose the option for that scuba diving, so I think I was able to proceed with the tour more smoothly. It was great to see turtles at the turtle point, and it was also cute and fun to see the clown fish in the anemone fish that were a little deeper. Even during the fun diving, the instructor kept checking to see if I was following along well and took responsibility for my safety. If your flight schedule and overall travel schedule match well, I highly recommend doing either the experience diving or the fun diving. In particular, no matter how good the water at the beach is, snorkeling in deep waters is really great because you can see in really clean water without any sand, so the field of vision is really wide and you can see deeply, which was great.