The film tells the story of the future world, human beings are unsustainable because of environmental pollution and viruses, and the genetic modification product "mirror man" came into being, under the contradiction of "life has already been set", three generations of mirror people are faced with the life issue of "accompanying, farewell, and living", and in the face of the ruthless tricks of fate, they are unwilling to choose to swim against the current and pursue their future youth.