AfamilicidemadeGuanHongyu,whowasoriginallyacarefreelibertine,awantedsuspectontherun.Asheadofthecriminalinvestigationdepartment,histwinelderbrotherGuanHongfengvowstobringthetruthtolight.However,GuanHongfengwastakenoffthecasebecauseheisanimmediatefamilymemberofthesuspect,soheresignedindignantly.GuanHongfenglaterworksasaconsultantforthepolice.However,Mr.Guan,the"consultant,"isactuallyplayedbythetwinssincetheelderbrothersuffersfromnyctophobiaandcan’tworkatnight.Sincethetwohaveverydifferentpersonalities,theystruggletoavoidbeingexposedbythepolice.AttheriskofbeingdiscoveredbyZhouXunandallsortsoffriendsandenemies,theyhavemanagedtosolveseveralimportantcasesalongtheway.