This film tells that Xiao Lan's adoptive father is addicted to gambling and has a personality that he will lose every time he gambles. He borrows from the elder sister of the brothel to gamble. He owes a lot of money every day.

Under the design of the elder sister, the adoptive father deceives Xiao Lan's mother who cannot read She confuses her to sell a girl into a prostitute's house without knowing it, receives a large sum of money, and happily has fun with her husband. Without knowing it, Xiaolan steps into the elder sister's head house, only to realize that the truth is too late. With syphilis, Xiaolan will never turn back.