叶维生讲述了:层间声音Anoiseiscomingfromthefloorupstairs.Eunsu,hearsthisforoveramonthwhichcausesuncontrollableangertoriseup.Shegetseliminatedagainfromacompetitionshehadpreparedforalongtime.Eunsudecidestowriteherlastpiecewiththethemeofthenoisebetweenthefloorsandpersuadesherfriendtohelpherfollowandtrackthesecret.