电视台主播韩京培（薛景求 饰）的孩子,男孩,少年,男童被绑架了，绑匪（姜东元 饰）打来电话要求1亿韩元的赎金，京培不得讨价还价。京培与妻子智善（金南珠 饰）都十分着急，无奈之下只好报警了，警方很快展开了调查。
　　警方的高科技调查方式对于狡猾的罪犯来说根本起不了作用。唯一有用的证据便是绑匪打来电话时被录下了的嗓音。一把低沉而且毫无感情的嗓音。案情一直没有进展，京培与妻子连孩子,男孩,少年,男童的死活都不知道。于是京培决心,打算,计划,准备自己出面，偷偷向绑匪提出见面的要求。

　　Chan-woo, who has been studying to become a police officer for 5 years, joins his friends for dinner to ask for the money to apply for his exam and ends up getting drunk. He completely blacks out and wakes up not remembering what happened in his next door neighbor's room. Not only that, he finds a bloody corpse in the middle of the room. He hurries back to his room and tries to report the incident but he had forgotten his phone in the other room. But the door is locked and he has to resort to using a rope to swing to the next door room outside the window. Once the phone is recovered, he cannot go back because of a group of cultists who are evangelizing the neighbors in the hallway. He knows it’s the last day to apply for his exam and gets antsy as time is running out.

　　事业有成的中年男子白成洙（孙贤周 饰）与妻子闽祉（全美善 饰）以及一双儿女户三和秀雅住在一幢高级公寓中，衣食无忧，欢愉,美满,欢乐,愉快,欣喜,喜悦,愉悦安逸。这一天，他意外收到一通电话，对方称成洙的哥哥成则失踪数月，下落不明。成则自高中后离家出走，期间履历中停留,驻留,滞留,逗留不光彩的记录。心中怀有隐秘的成洙来到哥哥所在的公寓，发现其房内有许多别人衣物，并且周围住户都对成则谈之色变，而各家门口也都标记了意义不明的记号。未过多久，一名头戴摩托盔的神秘男子袭击了闽祉母子，危险明显向白成洙一家逼近，有着严重洁癖的成洙精神几近崩溃。
　　豪华敞亮的私宅内，神秘之人悄悄入住，与主人玩起了凶险非常的捉迷藏……