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(Lightning protection: The plot of this article is progressing slowly) The apocalypse is coming, zombies are raging, and the once bustling city has turned into purgatory overnight. He Yaqin was trapped in an abandoned laboratory and accidentally met the calm and calm Yi Anlan and the impulsive but affectionate Che Zichen. The three of them had nothing and could only rely on each other to survive in a desperate situation surrounded by zombies. The mysterious "mute" and the crow quietly appear and become their only guides in the darkness. When the first crystal core containing power is obtained, the system suddenly awakens - becoming the [Crystal Core Evolution System]. With the help of the system, He Yaqin awakened a rare power of attack: Qinglan Thunder Technique. With a sudden flash of lightning, she became the sharpest edge in the team. There is no chance for a do-over, no room for retreat. Killing zombies, harvesting crystal cores, refining abilities, and guarding companions, three ordinary people struggled to grow up in the blood and mud, from being timid and panic-stricken to fighting side by side to the death. But they don't know that zombies are just the beginning. The truth of the doomsday is far more deadly than the visible terror. And all they can do is to hold on to their weapons, unleash their full potential, and find their own way to survive in this desperate world.