惡名昭彰的連續殺人犯李壬曜接受紀錄片團隊的採訪，因而引發了一連串神祕事件，而這一切都與一段塵封的過往有關。
Li Jen-yao, 25-year-old, turns himself in for a series of cold-blooded murders and admits to being the serial Rainstorm Killer, who once terrorized his high school classmates. While he reveals the grisly details of his crimes, he never discloses his motive. In prison, he grants his first-ever interview to Chou Pin-yu, only for her to become entangled in unsettling dreams of both the killer and a mysterious girl in uniform. As dreams and reality intertwine, long-buried secrets of love, hatred, guilt, and redemption resurface.
O célebre assassino em série Lee Ren-yao é entrevistado para um documentário, o que espoleta uma série de acontecimentos misteriosos ligados a um passado oculto.
O famoso serial killer Li Ren-yao é entrevistado pela equipe de um documentário, gerando uma série de eventos misteriosos ligados a um passado esquecido.
