PARK Duk-joon is an old man living by himself. Every night, he suffers from insomnia attacks brought on by disturbing flashes from his dark past. He tries in vain to pray and find solace in religion. His only friend is Mrs. LEE, a church elder who gives him weekly church bulletins. Mrs. LEE invites him to a testimonial at her church. Duk-joon is surprised to see the face of the speaker. He is LIM Gwang-han, Duk-joon’s former superior officer from his days as a police interrogator in the 80s. They meet for the first time in years, Gwang-han brings up Duk-joon’s painful past again.

　　年幼的妹妹遽然离世，让孤独的青年李在贤（柳德焕 饰）万念俱灰。虽然放弃了轻生的念头，不过他的人生也一切重来。在朋友的帮助下，他在一家补习机构供职，借着教书寻找生的感觉。某天，一个奇怪的女孩闯入李在贤的生活。她叫朴秀贞（郭智敏 饰），因男友去世以及和后母交流不畅而闷闷不乐，沉默的外表下仿佛隐藏着无尽的心事。偶然间，李在贤发现秀贞能够侵入他的大脑，知道他一切的想法。在秀贞的引领下，在贤甚至进入了一个奇妙舒适的世界。他对秀贞既感惊奇又着迷，然而这个美丽且神秘的女孩某天却不辞而别。
　　枯燥乏味的生活由此发生转变，卷入其中的却不止一人……