Synopsis

Detective Oh Daesoo encounters Hwang Dongsoo, the serial killer he previously apprehended, who is now a 'player' within the dungeon, along with other dangerous criminals. The dungeon environment begins to drastically change, undergoing an 'expansion' phenomenon where objects become massive, and powerful mobs begin appearing, putting Daesoo and the other players in extreme danger. Daesoo realizes that some players are targeting them, including him, as they try to escape the chaos.