Asafreshgraduateofthepoliceacademy，QianXiaotian'sgreatestdreamistojointhecriminalinvestigationdepartmentandbecomeadetective.Butbyatwistoffate，heisacceptedintotheTrafficCorpsPDUwithtopscores，wherehebecomesaninternasadogtrainerandevengetsassignedaproudpolicedognamed"Dumpling".Thus，QianXiaotian，whosedreamhasbeenshattered，beginshispainfulprofessionallifeatthePDU，whereeverydayisabattleagainstheaven，earth，anddogs.AsQianXiaotiandivesdeeperintohisjob，hefindsanewunderstandingofthedogtrainingprofession.Heseesoldage，illness，anddeath.Hepassesthroughtrialsandtribulations.Helearnstopersevereorgiveup.Joyandsorrowareintertwined.Therelationshipbetweenpolicedogsandthetrainersisnotonlyastorybetweenhumanbeingsanddogsbutalsoabouttruecamaraderie.Intheend，QianXiaotianandhisdogeventuallybecometheprideandjoyofthePDU.