Professional bridesmaid Zhen Xin relies on hardcore equipment to expose the groom's scam of swapping a real diamond ring and concealing debts with invisible ink right at the wedding, successfully rescuing the bride Lin Xiaoya out of the mire. Since then, Zhen Xin has founded a pre-marital due diligence studio specially dedicated to escorting women. However, on the opening day, a property notarization document containing hidden calculations has just been delivered, and a trembling cry for help from a bride-to-be suspecting her fiancé of plotting to murder her for money comes from the access control intercom. Facing the heavy fog behind sweet words, can Zhen Xin see through the disguise once again and leave scoundrels with ulterior motives nowhere to hide.