《昨天》是由郑允秀执导，崔民秀,金宣儿,金承佑主演的科幻片。该电影于2002年在韩国上映。1990年韩国连续发生多起诱拐案件，6名小孩相继失踪。与此同时，在国防部内，一群顶尖的科学家正研究着一项国家最高机密的计划，在地下隐藏着他们秘密的研究室，那里面藏着一批消失的孩子。时光跳跃到三十年后，2020年的朝鲜半岛，突然出现一宗接一宗的连环谋杀案，被杀者全部都是科学家。于是南北韩的代表为这宗案件成立了专责的调查组，他们均配备了先进的装备以方便调查案件。然而纵使调查组布下天罗地网，可是罪犯仍然可以轻易逃脱。这一次，另外三名科学家又遭绑架。而这些谋杀案却隐藏著一个玄机，就是他们都有一个共通的密码——“Yesterday”……
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