Eternal life is the most cruel gift from God. He will experience gain and loss again and again, and witness all the good things turn into dust. His tragedy lies not in death, but in the eternal loneliness brought about by "the inability to die."
Shen Yanmo went from vigorously exploring history, to becoming bonded with historical figures, to suffering the pain of separation, and finally to exploring the meaning of his existence in endless years, trying to find a way to end eternal life.