▁Bus an , ▁where ▁mur ders ▁were ▁never ▁reported , ▁bodies ▁were ▁never ▁found , ▁and ▁investig ations ▁never ▁happened . ▁ ▁Plot ▁Kim ▁is ▁a ▁wid owed ▁n arc ot ics ▁officer ▁who ▁meets ▁with ▁a ▁potential ▁inform ant ▁named ▁K ang . ▁As ▁they ▁are ▁talking ▁at ▁a ▁restaurant , ▁K ang ▁is ▁arrested ▁by ▁the ▁hom ic ide ▁division ▁for ▁killing ▁his ▁girl friend . ▁He ▁conf esses ▁to ▁the ▁murder ▁and ▁is ▁put ▁behind ▁bars . ▁ ▁A ▁few ▁months ▁later , ▁K ang ▁contacts ▁Kim ▁from ▁prison ▁and ▁claims ▁that ▁he ▁has ▁murder ed ▁six ▁other ▁people . ▁However , ▁he ▁ref uses ▁to ▁talk ▁to ▁the ▁hom ic ide ▁detect ives ▁who ▁he ▁claims ▁fabric ated ▁evidence ▁against ▁him ▁to ▁have ▁him ▁imprison ed . ▁Kim ▁agre es ▁to ▁find ▁the ▁real ▁evidence ▁in ▁exchange ▁for ▁information ▁on ▁the ▁remaining ▁six ▁bodies . ▁Kim ▁un co vers ▁the ▁actual ▁evidence ▁with ▁K ang ' s ▁information , ▁prov ing ▁the ▁hom ic ide ▁detect ives ▁fabric ated ▁his ▁case . ▁As ▁a ▁result , ▁the ▁detect ives ▁are ▁charged ▁and ▁K ang ' s ▁sentence ▁is ▁reduced . ▁In ▁return , ▁K ang ▁provides ▁information ▁on ▁the ▁six ▁remaining ▁vict ims ▁as ▁promised . ▁ ▁Of ▁the ▁six ▁remaining ▁vict ims , ▁Kim ▁first ▁investig ates ▁the ▁disapp earance ▁of ▁Oh ▁Ji ▁He e , ▁a ▁former ▁sw immer ▁who ▁is ▁forced ▁to ▁work ▁at ▁a ▁night club ▁to ▁support ▁her ▁grand m other ▁in ▁the ▁village