I recommend the following Red Alert novels to you: Red Alert: The End of the World: A novel written by the author, Wu Liyuan. "Doomsday: My Red Alert is a Billion Points Strong" was a futuristic novel written by the author, I Have Any Door. [Mission Red Alert: The Legend of the End of the World]: An apocalyptic crisis novel written by the author, Yuanyu Qingyun. The above three novels were all set in the apocalypse. They described how humans survived in a world where all kinds of changes were rampant. They built their own bases through the Red Alert System and overcame various crises. I hope you like this fairy's recommendation. Muah ~😗