Summary
Five years after the end of the world, the earth has been reduced to a purgatory. His sister, who was poisoned, was abused by a magical beast, but Chen Yan had no power to fight back. But when he woke up again, he found that he was reborn before the end of the world, and he also had supernatural powers! The system came down and told him the way to save his sister. But the premise is that he must upgrade madly to stop the end.
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