Hong Kong butterfly

My parents live in a house in a village, which my grandparents also live in when I was a child. My mum seems to spend a lot of her time tending to her vegetable patch, which given the variety of wildlife, must be a nightmare to keep pest-free. She claims everything is organically grown and without the use of plant sprays.

My sister says this is a pretty common butterfly in Hong Kong, and might even have told me its name. My insect stalking skills are usually pretty lousy, even worse than my insect-naming skills, so am pleasantly surprised this came out other than a couple of white-ish pixels.