Hi Ryu. The easiest way to tell males from females is to look at the upper side of the fore wings. In the male they are silvery grey, and at the front edge of the wing at about the middle position there is a white spot edged with black. In the female the upper side of the fore wing is cream, with an irregular black blotch in the middle of the front edge and 1 or 2 additional black spots not connected to the front edge. There are good images in Michael Braby's 'Butterflies of Australia: their identification, biology and distribution' (CSIRO Publishing, 2000). Unfortunately the butterfly in your image was shy about showing the upper side of its wings.
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