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Suk-Go (Ryoo Seung-Bum) is a brilliant mathematician. His life though is largely empty. Hwa-Sun (Lee Yo-Won) is an attractive young woman on the run from her past. She lives next door to Suk-Go. One evening, Hwa-Sun's former boyfriend surprises her at her apartment. Hwa-Sun fled her small hometown to get away from her violent ex-boyfriend. Her boyfriend is there to get revenge. He proceeds to beat her violently. Meanwhile, Suk-Go sits alone in his apartment. He hears clearly the violent struggle taking place next door. Finally, Suk-Go decides to knock on his neighbor's door. Soon, Suk-Go devises an intricate plan to cover up a crime. Hwa-Sun begins to have doubts about Suk-Go and wonders if he is yet another pyscho. Suk-Go has secrets as well.