继母：我的初恋女老师

　　Six people bound together by a traumatic experience decide to round off a year of group therapy in style. They join each other once more, traveling up to the Scottish Lowlands for a reunion weekend in a 1970s holiday let. Soon a number of mysterious and horrifying events start to expose the cracks in their relationships, and one by one they discover that trust runs but skin-deep. A night of closure turns out to be far more final than they could have anticipated.

　　熙琏（廉晶雅饰）的儿子俊叙在首尔走失了，伤心欲绝的她带着失忆的婆婆回到老家苌山休养，希望婆婆能早点想起俊叙是怎么失踪的。有一天，熙琏在苌山附近的洞穴遇见一个衣衫褴褛的神祕女孩，或许是同情怜悯，或许是空虚寂寞，熙琏将女孩带回家，打算在找到无名女孩的父母之前照顾她。两人日渐亲近，渐渐地女孩变得好像熙琏的女儿一样，她喊起熙琏「妈妈」，还叫自己「俊希」，容貌与音声越来越像消失无踪的「俊叙」。神秘女孩到来之后，陆陆续续发生难以理解的怪事，熙琏的婆婆先是幻听，然后还被传说中栖息在苌山洞穴的妖物掳走……熙琏能够找回儿子俊叙吗？破碎的一家能在妖怪阴影之下再度团圆吗？

讲述某处某个“式”的故事——它究竟是祝福，还是一场离别的仪式？答案，藏在某个尚未抵达的地方。