Wealthy female protagonist Gu Wanqing trusts her family nanny, Liu Ma, and because of her fear of mice, asks people to use cement to seal the villa's wine cellar and ventilation shafts. Little does she know that Liu Ma has long hidden five family members in the wine cellar, and has also long slipped sleeping pills into Gu Wanqing's milk to facilitate her family's living and stealing there. Sealing the wine cellar leads to the victims inside perishing. After Gu Wanqing faints and is sent to the hospital, the truth of her long-term drugging is exposed. Liu Ma's relatives go to the hospital to cause a disturbance and demand compensation, which is stopped by the police. The case is full of suspicious points, awaiting further police investigation.