Immortality is one of the themes used by Sun Haijin in recent years.  Over times, the meaning of immortality changes.  There is no immortality in the human world.  This was a concept of comparing time before Karlswarzhild's theory of black holes.  From a human perspective, time stopped and immortality come true. Sun influenced by Cixin Liu's science fiction novel The Three Body problem. Liu is the winner of the Hugo Award, in this novel, he set the background of black hole theory and space-time curvature. There is another novel, Time Migrants, which also gradually inspired Haijin. Haijin’s works became abstract, and contained abstract concepts, colors, and shapes that were not affected by the logic of time.