《下水井》是由Shin,Jae,Young执导，金赛纶,郑敬淏,郑裕美主演的剧情片。该电影于2014年在韩国上映。潮湿喧嚣的大都市内，妍舒（郑有美 饰）和未成年的妹妹秀晶（金赛纶 饰）相依为命。秀晶早年因一起事故丧失听力，内疚的妍舒背负着抚养妹妹长大成人的重任，殚精竭虑照顾秀晶的衣食住行。接连一段时间，城市中有女性神秘失踪，而她们全被一个居住在下水道里的男子（郑敬淏 饰）劫持并杀害。男人曾遭受不幸的童年，黑暗的经历扭曲了他的性格和灵魂。他精心将下水道改造成独立的王国，通过密布在大街小巷的摄像头监视路人的行踪，并锁定狩猎目标。 直到某天，秀晶也被这个男子盯上。突然中断的电话让妍舒焦虑不安，为了救出妹妹她不顾一切闯入了危险重重的下水道……
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