The Nine Regions Sky City was a fantasy novel written by Jiang Nan. It told the story of a group of young people taking risks, fighting, and growing up in Nine Regions. At the end of the novel, the protagonists have already embarked on the journey home, but they find that Kyushu has undergone tremendous changes, and the homeland they protect is no longer suitable for them. The protagonists were faced with new choices and challenges. They needed to decide whether to stay in Nine Regions or choose to leave and look for new adventures. In the end, they made the decision to stay in Nine Regions, but they also knew that this would not be an easy task. They needed to face a more dangerous and complicated environment, as well as the threats from other forces in Nine Regions. At the end of the novel, the protagonists bid farewell to the homeland they guarded for the last time. They embarked on the journey home and left a deep impression on Jiuzhou and the world.