Undercover!

(No system, not invincible, plot-oriented, emphasizing human nature, non-routine and cool writing) (Growing protagonist, whose personality will change with the plot) (Group portraits and supporting characters are not facial makeup, they will show their appropriate emotions according to the changes around them) Natural disasters hit the world, and extreme cold and high temperatures echoed each other. People have lost the technologically advanced culture of the past, completely embraced the historical gap, and are living under the overthrow of their nests. In troubled times, who is the enemy? … Survival is the only criterion!