Civilians and injured personnel are evacuated while the military reorganizes after an initial monster attack. A character named Kwon Jaeyong possesses a Hero-rank helmet that prevents fear, and a 'data book' belonging to another character, Go Hyeju, contains detailed mission info, monster data and personal information which is used to confirm its authenticity. The data book also reveals a unique property: sharing its knowledge monopolizes the rewards of those who receive it. The protagonist receives permission from headquarters to strategize and prepares to lead a defense mission using the book's information, also with an intention to figure out a way to return to their original world after it is over.