After his death, Duan Fei regresses 20 years back in time to just a few key hours before the virus catastrophe is set to begin, and was given a chance to remedy the regret he has shouldered for the past 20 long years. He utilizes all the knowledge he has amassed prior to his regression to arm himself in preparation for the oncoming apocalypse. His newly acquired 'Evolutionary Tree" is also helping him constantly improve his strength. Duan Fei, who had to give it his all just to barely survive in his previous life, is now the hero and future savior of the world.