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In his previous life, Lin Feng was just an ordinary urban white-collar worker. The "Great Nirvana" came, and he was unprepared and watched his parents die in the cold and chaos. He struggled to survive for ten years, from a helpless young man to a ruthless doomsday warrior. He joined a survivor base and suffered betrayal from humanity. In the end, he was destroyed along with the base in a battle with the powerful mutant beast "Ice Tyrant". With endless regret and unwillingness, Lin Feng suddenly woke up and found that he had returned to a month before the "Great Nirvana". He was sitting in his office. The sun was shining outside the window and the world was peaceful. This time, he will never make the same mistake again!