Divorce First, Then Expose the Fake

Su Wan, eldest daughter of the city's richest family, hides her Su Group identity so her father can test whether her husband deserves the company. Three years on, Gu Mingyuan won't even pay for groceries, and he's sleeping with Cheng Qingqing, a cleaner who is really the chauffeur's daughter posing as the Su heiress. Su Wan demands a divorce, and during the thirty-day countdown she lets the cheater and the fake dig their own graves before revealing who she is.