白素贞的孩子为何不是半妖
[bái sù zhēn de hái zi wéi hé bù shì bàn yāo]
A play on traditional Chinese folklore. 'White Snake' is about a woman who is actually a snake spirit named Bai Suzhen. She had a child who was a human rather than a half-demon, this could suggest disbelief at something going against logic/rules/nature.