About

The year is 2020. Human civilization has become far more powerful than we ever imagined. Thanks to this, we have been able to protect many life forms and cities, gaining immense convenience. However, an event occurred that shook the entire world. One day, a massive meteor was detected on NASA's radar. NASA attempted to respond quickly. They succeeded in destroying the meteor, but countless fragments rained down upon a single city. Buildings were demolished, and people were killed or injured. Then, something shocking happened: countless alien mutants poured out from the meteor fragments. These alien mutants infected humans, turning them into their own kind. Naturally, the government dispatched the military to the city. However, not a single soldier returned alive. They tried helicopters, missiles, and fighter jets, but all they gained was death. Realizing the severity of the situation and judging that the damage would spread, the government designated the city as a restricted zone. Twenty years later, due to the alien invasion and the impact of the meteor fragments, the city has transformed into an island-like terrain. People call this city the "Lockdown Zone." Naturally, renowned experts and specialists went to investigate, but no one ever returned alive. And now, the mission to investigate the Lockdown Zone... ...has been assigned to Guest.