Lamenting the Eight Cities, the Sin of Savior

If you take something, you will lose it, which is the sin of saving the world. In this different world from Chen Xu's imagination, how can we find the secret of the second life? How can I fulfill my brother's wish? How can we save this world that has nothing to do with us? Perhaps rebirth in this world is also a part of saving this extreme world. (I am a high school student and it is my first time to write a novel. I want to share the stories in my mind with more people. I hope readers can comment lightly and give me more suggestions. Thank you.)