In some cultures, immortals in red clothes may be regarded as gods of wealth or happiness. In the traditional culture of China, some immortals are also depicted in red clothes. For example, in Taoism, there is the image of "Hon Hai Er", which is regarded as a symbol of good fortune.
In short, dreaming of the red fairy may be a sign of good luck, but we should also pay attention to the details of the dream, personal experience and background.