On a stormy night filled with thunder and lightning, two bodies, one downstairs and one on the rooftop, were discovered along with Wang Jianli, who had suffered a mental breakdown from the shock. A witness found them and called the police.
The team leader, Li Lingshan, and his apprentice, Hao Yuting, were stuck in the office by their work and the torrential rain. Unsure how to handle the situation, they received the call.
The investigation turned up no evidence or leads. The witness had only seen the female victim, Huo Man, fall from the rooftop. Was it manslaughter? Murder? Or something else?
The only available surveillance footage revealed that the body on the rooftop belonged to Wu Dexing, the head of a corporation. When his wife, Wang Li, learned of her husband's death, she postponed her business trip and returned home. This aroused Li's suspicions, and he began investigating.
The witness changed his story. He also remembered seeing Wang Jianli chase Wu Dexing downstairs with a knife, while Huo Man ran after them, trying to stop him.
Li Lingshan sensed that someone was pulling the strings and began investigating the witness, Wang Li, and the family and friends of Wu Dexing and Huo Man.
The people under investigation and the witness disappeared one after another, while several so-called witnesses who misled the investigation appeared.
Drawing on his experience, Li and the meticulous Hao used a strategy to lure the snake out of its hole, forcing Wang Li to reveal herself as the one behind it all.
Using the clues he had pieced together, the testimony of a petty thief who had become an accidental witness, and the improving Wang Jianli's accusation that those people were damned, Li uncovered how Wu Dexing had coerced Huo Man into having an affair.
He also discovered Wang Li's scheme to protect the company's interests, and the truth behind the deaths of Wu Dexing and Huo Man: they had not been murdered, despite being condemned as damned souls.