After his death, Duan Fei regressed 20 years back in time to those key hours before the virus catastrophe was set off. Now he'll have a chance to remedy the regret he has shouldered for those 20 long years. He will utilize all the knowledge he brought back from his previous life to prepare for the oncoming apocalypse. His newly acquired ‘Evolutionary Tree” will help him continue to grow stronger. Duan Fei was just a survivor in his previous life, now he will be the hero and the savior of the world in this life. (Source: Kuaikan, translated)