Continuity Boundary

In 3318 AD, human civilization has expanded to the stars. The vast majority of people abandon their biological bodies and move their consciousness into the core of their mechanical personality, calling themselves "successors"; a small number of natural people live in closed autonomous territories, protected and isolated by civilization. In the Helios No. 4 North New District, mechanic Lin Zheng received an abnormal report: the city detected a life, but could not confirm that she was a "human". In an abandoned underground facility, he met Su Rui, a natural girl who had escaped. She carries a physical key from eight hundred years ago and is looking for a missing historical researcher. The two men's investigation gradually revealed the buried truth of the war in 2474: deleted records, abnormal personality time stamps, secretly preserved biological genealogy, and the "Ark Protocol" that can change the human form. When the truth caused social shock, natural people and descendants once again turned against each other. Some people want to restore the old humanity, some want to maintain the current order, and some people try to choose the body and future for everyone in the name of saving civilization. In order to prevent history from repeating itself, Lin Zheng and Su Rui must return to the solar system and answer a question in the original hometown of mankind: When memory, personality and body can all be reconstructed, where are the boundaries of human beings?