So I grew up in the UK (where believe it or not, the national dish is now considered curry). So I have been eating Indian food for the last 25 years.
This place has excellent Indian food. The service was great and the staff very friendly. I did order a Kingfisher beer which turned out to be way out of date. So that got returned and I had a local brand instead.
Two of us, ordered main courses, rice and nan bread. Plus my beer. Was a total of about US$33. We left full and very satisfied. Value for money was awesome. It might be you can get other food that is cheaper, but I have had a few dishes in Jeju and this is the one I would recommend to anyone visiting.
One note: parking a car is not easy. Plan to get to the approximate area and the find a spot and walk. The roads get tight and hard to find spaces.