**Blood Invitation**: Criminal investigation captain Lu Jinghe found a mysterious gold foil invitation at the scene of a serial case. Forensic doctor Fu Chiye found through autopsy that the deceased all died of drug poisoning but showed no signs of struggle. The two collaborated for the first time and fell into a strange mystery.
- **Death Code**: The "Han Guang" poem on the lapel of the third corpse conceals a countdown to death. Lu Jinghe cracked the poem code and discovered the next crime location predicted by the murderer. When the two confronted each other in the ancient bell tower, they discovered that the murderer was deliberately imitating the case that had been unsolved half a year ago.
- **Bloody Pocket Watch**: The moment of death when the pocket watch stopped became a key clue. Fu Chiye discovered fluorescent markers hidden in the blood of the deceased in the autopsy room, pointing to the mysterious sect "Xuanguang Society" that was banned twenty years ago.
- **Dark Night Confrontation**: The fluorescent totem on the underground altar of the church confirmed that the murderer was performing a resurrection ceremony. Lu Jinghe was injured while protecting Fu Chiye. The two confirmed each other's feelings at the critical moment of life and death, and finally revealed that the man behind the scenes was actually the survivor of the unsolved case that year.
Purpose: fairness and justice