Nothingismorefrightening,asthenarratorpointsout,thana‘time-richnosyperson’.ExhibitAisAhnGeo-ul(GyeongSu-jin),whocommitsherselftosocialjusticecauseswithterrifyingtenacity.AftertemporarilyrentingaunitintheBaek-saeApartmentbuilding,shediscoversthataloud,hardtolocatebangingnoiseoccursfrom4ameverynight,makingtheresidents’livesaninsomniachell–andsoshedeterminestoengageinherowndisruptionandtofindtheculpritofthisacousticassault,simultaneouslyeliminatinghereccentricneighboursassuspects,andrecruitingthemtohercause. Focusingonawomanwhoisanunstoppableforceforgood,itisalsoapleaforcommunitycohesionandsolidarity.
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