The TVB sci-fi suspense drama "The Mysterious Files" takes you to track down a series of unexplainable strange cases and uncover the mystery of some incredible powers! Gao Yongxian (Luo Jialiang) is a professor of biochemistry at a university. He is calm-minded, believes in science, and opposes superstition; Wen Jiali (Zhang Keyi) is a data writer for a TV station's information program. Because he has experienced strange adventures, he "would rather believe it than not believe it" for all the strange things in the world. The two of them worked together by chance and tried to find the truth of some strange cases, such as "genius idiot", "reincarnation", "black magic", "cult", "different dimension" and "evaporation". During the cooperation process, the two had conflicts and misunderstandings from time to time because of their different views, but they still understood each other in the end and gradually became lovers. Once, Li was killed by a knife while trying to save Xian. In order to help Li come back to life, Xian had to bravely enter the fourth dimension...