A terrible incident occurs where one office worker kills his entire family. The office where the suspect used to work is turned upside down, and Detective Choi of the regional investigation unit begins to dig deep into the case. But then... The suspect's co-workers are swept up in fear with the thought that the suspect could still be at the office. But, it looks like the intern Lee Mi-rye is hiding something. And...strange, mysterious incidents begin to occur at the office. There's the feeling of fear and horror at the place we work in. It's a realistic horror thriller. It°Øs the new movie 'Office.'