The Seventh Infinite Loop

Forensic doctor Zhang Chengyu finds himself trapped in a time loop. Every time he wakes up, it is the same day, and on this day, his best friend will be killed. In the seventh cycle, he decided to take the evidence collected in the previous six times to stop the murderer, only to find that the murderer was himself who had "successfully solved the case". In order to break the cycle, he must personally forge a perfect crime scene and guide his past self to find the "real murderer"...