*Ability Awakening**: Criminal police captain Qin Mo was killed in an explosion while investigating the "Rainy Night Butcher" serial murder case. He accidentally acquired the "death retrospective" ability. Every time he dies, he will go back to 72 hours before the case.
- **First case solved**: Qin Mo collected clues through multiple death retracements and discovered that the murderer was Zhou Mingyuan, a seemingly elegant university professor. His motive for committing the crime stemmed from the revenge psychology caused by childhood trauma.
- **Key Assistant**: Forensic doctor Lu Li became an important ally of Qin Mo with his professional ability, and the two established a special relationship of trust during the process of solving the case.
- **Price of the Truth**: Qin Mo finally set up a trap to expose Zhou Mingyuan, but had to pay for his own serious injuries in exchange for evidence. After the case, his abilities were reset and he entered the next case cycle.
- **Hidden clues**: Qin Mo discovered that there is a mysterious symbol "∞" behind each case, suggesting that these seemingly independent cases may have deep connections.
