In the not too distant future, a simulation system that is close to reality has been developed, and participants feel as if they are in the simulation system. System developer Tom Ford (Sean Faris) and his partners continue to upgrade it, and actively cooperate with the military to conduct real-life anti-terrorism drills. One night, Tom and two other partners set up the system in an abandoned prison. Previously, this prison, which belongs to the British government, was used to torture terrorists related to the 9/11 incident. The eerie atmosphere here just meets Tom's needs. This group of big boys full of childlike innocence entered the system and fought against virtual terrorists. However, as the game progressed, some plots that did not originally exist in the system began to appear. Driven by the trend of desire, this group of young people indulged in sensual violence and did not alert to the abnormal situation, but they did not know that danger was quietly approaching them...