One day, a body is found on the street. The deceased is 'Jay'. He is an investigator from the future, just like Investigator K (Ha Seok-jin). There is only one clue related to his death, the 'Overworld (virtual world)'. Investigator K puts on 'Neuroconnect' and enters the virtual world. There, he discovers a path to another virtual world, and as he enters the virtual world within the virtual world, he witnesses a shocking scene.
