Episode Summary
The police mourn Wan Guoxin while the investigation into the new drug intensifies. Qi Sizhe discovers the drug is an evolving experiment. A task force targets Nuosha's gang, leading to a shootout and the capture of Fan Biao. Interrogations reveal the drug lord is hunting for a "master chemist." Han Feng prepares to go undercover to intercept the next deal.
Spoiler Alert
A Cold Start and a Sad Goodbye
Qi Sizhe arrives too late. He stares at the cold body of Chen Chuchuan on the autopsy table. The sight brings up a mess of emotions for him. The doctor is gone.
Zhu Qingyue has a harder task. She packs up Wan Guoxin’s belongings. A photo sits on the desk. It shows her, her brother, and Wan together. It is a painful reminder of better days. The precinct holds a memorial for Wan Guoxin. Every officer takes off their hat. The silence in the room says everything.
The Chemistry of Chaos
Forensics pulls fingerprints and skin cells from the scene. They identify a suspect named Wang Bo. He went to jail four years ago for assault. He vanished after his release. He has a girlfriend named Fan Xiao. Zhu Qingyue takes a team to check her out.
Qi Sizhe dives into the science. He compares samples from Li Yiqi and Chen Chuchuan. He realizes the drugs in their systems were experiments. The chemical formula keeps shifting. This is a new type of narcotic. It is still in the testing phase.
The province takes notice. They form a special task force. Cao Liangsheng from the anti-drug unit takes charge. We learn the victims were all mental health patients. Chen Chuchuan prescribed them medicine laced with the new drug.
Symptoms and Suspects
Qi breaks down how the drug works. It starts with euphoria. Then the hallucinations kick in. Fear takes over. Finally, the user becomes violent and self-destructive. The atomic makeup matches the "Original Diamond" compound.
A new body shows up. Police find powder near the corpse. It tests positive for the new drug. Surveillance footage reveals a face. Guan Lixing recognizes him immediately. It is Fan Biao. He works for the drug lord Nuosha. Han Feng admits he made a mistake on the previous case. Qi keeps his eyes on the prize. He wants the truth about the Xiao Fei case.
The Takedown
Zhu Qingyue and Su Huaining track down Fan Biao. The suspect panics. Su Huaining gets into a brawl with him. Fan Biao pulls a gun. It looks bad for Su. Han Feng raids the hideout and grabs another suspect. Zhu Qingyue arrives just in time. She shoots Fan Biao. They take him into custody.
Han Feng and Zhu interrogate Fan Biao and his partner, Crow. The criminals act tough. The police use the "Prisoner's Dilemma" tactic. Qi Sizhe assists with the psychological pressure. The thugs break. They admit they killed the victim over a bad drug deal.
The Master Chemist
Fan Biao spills the details. Nuosha sent them to find a psychologist with a medical background. They called for days with no answer. Nuosha believes a master chemist is behind this new drug. He wants that person found.
Crow gives up a location. They were supposed to meet a contact named Ah She. Han Feng steps up. He will pose as a buyer to infiltrate the meeting.
The episode touches on old wounds. Qi Sizhe used to be a guest professor. Yu Fei was his student. She was talented. Han Feng wanted her to quit forensics for her own safety. She refused. She died later. Qi still blames himself for her death.
