《麻花出品必属精品》Ayoungcoupleretreattoaglasshousefortwoweeksofcelibateself-improvementbutaredisturbedbyalosthiker.Asthestrangerrevealsmoreofhimself,theirfeelingsmovefrompitytorevulsionandtheymustmakeadecisionaboutwhattodowithhim.Butwhenthecrisisisseeminglysettled,strangeforcescompelallthreetoreplaythisscenarioagain.