Fivemembersofthemountainbikeclub,Sangaja.Torideamountainbike,weheadtoChiaksanMountain,whereMin-joon’sUnclevillaislocated.AfterarrivingatChiaksanMountainandenjoyingtheride,strangethingsbegantohappentotheparty….Andsomethingunidentifiedchasingthebbb!AdesperatesurvivalgameforSangaja’spartytosurviveonChiaksanMountainbegins.