The Tender Age (1957)

Han Xiangying temporarily resides at her classmate Fan Daini's resplendent mansion. Mrs Fan eggs her on to attend a party at which she is raped by a rich businessman. It turns out that Mrs Fan is in fact a procuress exerting control over her three daughters of the ruined family. Han manages to escape the clutches of Mrs Fan with the assistance of the honest young man Gong Liqun.