It's Called Doomsday Pretender

Li Huanyan, a weak and miserable junior high school student. She was hospitalized for a month, but her illness was incurable. After taking the medicine given by the strange doctor, she returned to school at the speed of light. Li Huanyan thought her life would be smooth until the high school entrance examination. But on an ordinary afternoon, the situation changed, black water overflowed, and a girl died suddenly on the spot. But her death does not mark the end, but the seven major changes are no longer secret. There were constant twists and turns, and Li Huanyan desperately escaped, until fate displayed a blood-stained cloak and told her: "Disguise it until you die." Apocalyptic survival/species war/science fantasy Micro group portrait/protagonist has no love line