DuringtheperiodofRepublicofChina,SuZhengHuai,ajuniorofficerintheDepartmentofHealth,wenttotheprovincialcapitaltovisithisrelativeswithhiselderdaughterSuTingandhisyoungestsonSuYueSheng.Inthetrain,hemethisyoungerdaughterSuLing.Shehadbeenmissingforalongtime.Duringthetrip,thetrainwasattackedbyrats,andSuYueShengwasbittenandwentintoacoma.Tosavehimandmanyotherpassengersbittenbyrats,SuZhengHuaiandSuTingdecidedtotaketheriskandgotoXiaobaiheHospitalfortheantidote.Itwouldbeadangerous,terrifyingrun.