The Deceased Is Not yet Born

I am Xu Zhiwei, 29 years old, an investigator. A 68-year-old female body was found in a closed apartment. She had no entry records, no trace of her life, no fingerprints. But she had my DNA, my old file number, and a wound I hadn't suffered yet. All the evidence tells me: the deceased is from the future. And the murderer who sent her back may also be me.