RT by @nct_official_jp: NCT DREAM ‚CHILLER‘ & ‚BTTF‘ Dance Practice Behind the Scenes youtu.be/ukOTyUXtxQE #NCTDREAM #엔시티드림 #BTTF #NCTDREAM_BTTF #CHILLER #NCTDREAM_CHILLER #GoBackToTheFuture #NCTDREAM_GoBackToTheFuture