The background of the love story that happened on this island.

There's a pretty powerful organization living there. All of them are allowed to hold guns. Some are good at gambling, some are good at stealing I remember that in one of the movies, the female protagonist's sister seemed to be a dancer who was very bad to her sister. She always relied on her beauty to harm the female protagonist. She liked the male protagonist and doted on her sister. She was willing to do anything for her sister. In fact, the female protagonist looked better than her sister. It was just that she did not dress up. The male protagonist wanted to chase her sister at first, but later he liked her sister. The male protagonist even invited their club to perform on the island.