The doomsday crisis of the earth is coming, and the dark group is rising again. Let's see how the strong fighters who traveled back to their youth break through the doomsday crisis. Note: Because this is a novel, Tiger hereby solemnly declares that the content of the novel has There are many crises that may erupt in the future world, so all the plots and contents in the novel are fictitious, from the exaggeration and creation of art. This art and exaggeration creation includes but not limited to various science and technology, qigong and Cultivation, elixir production, treatment methods and theories of various diseases, etc., please do not take the fictional plot content seriously and bring it into your life! Thank you everyone!