Neon(Film)isalate-nightemployeeataself-servicelaundry,whileNight(Nanon)isayoungdetectivenovelist.NighthadpreviouslysponsoredNeonduringadisputewithacustomeratthelaundry.UnbeknownsttoNight,NeonstealsabriefcasecontainingmillionsofbahtfromNight'sroom,whomshehasfalleninlovewith,andtakesitbacktoherdormitorybehindthelaundry.NightcatchesNeonanddemandsthebriefcase,butit'snowheretobefound.Thetwomustworktogethertouncoverthetruethieffromtheonlyclueleftbehindinthelaundry'sapplicationrecords.Thesuspectsincludeahandsomestudent(Pond)whositsintheshopreadingforhisexams,theapartmentmanager(Gotji)whereNightresides,andarocksinger(Foei)andhislover(Jenny).