The ending of Cai Jun's novel 'The World' was as follows: At the end of the story, the female lead, Bai Jingjing, left this world after completing her mission. She left a letter to tell the male protagonist Duan Senwen that she would return to the human world, but he did not know if she would return. Duan Senwen also felt unusually lonely after Bai Jingjing left. He had been missing her, but he also knew that Bai Jingjing would not come back. The ending of the novel expressed people's thoughts on life and existence, as well as people's understanding and perception of love, friendship, responsibility and mission.