In the bustling night market, various life stories are connected in series. Every night here is a colorful picture, with the cries of vendors, the laughter of tourists, and the homeless people looking for warmth in the corners. But recently, a few drops of bright red blood penetrated the picture, and a series of murders broke the tranquility of the night market.

The victims in the case were all homeless people in the night market. The cause of their death is unknown, but the cooking utensils left at the scene make people wonder whether these tools, which are usually used for cooking food, have become deadly weapons. The complex population flow in the night market, coupled with the mixing of blood stains with food residues and garbage, makes it extremely difficult to collect evidence. The police investigation progressed slowly until two female police detectives, Lin Wanyu and Zhao Yuchen, who graduated at the same time, decided to intervene in the case.

Lin Wanyu and Zhao Yuchen are outstanding graduates of the police academy. They not only have outstanding looks, but more importantly, they have keen intuition and perseverance. In order to uncover the truth, they decided to go undercover at the night market and transform into auction ladies. Day after day, they patiently observed, recorded, and even risked their lives to get close to suspicious characters. However, the truth always seemed out of reach until they used spectral analysis technology – a portable Raman spectrometer.

This kind of analyzer can instantly detect the molecular structure of a substance. By chance, Lin Wanyu found trace substances containing palladium, platinum, rhodium and other elements in a trash can near the crime scene. The discovery of these elements, usually found only in a car's catalytic converter, immediately caught their attention.

After further investigation, they discovered that Huang Wei, the owner of a car repair shop near the night market, had a dark past with the homeless people on the streets. A few years ago, his younger brother owed a huge debt due to gambling, was defrauded out of everything, and ended up on the street. Although Huang Wei tried his best to help, his younger brother still died in the night market where this story takes place. The authorities hastily attributed it to a dispute between homeless people fighting for begging territory. He died unexpectedly during the dispute. None of the homeless people present were killed. Hold accountable.

Huang Wei does not believe this official explanation. He is convinced that his younger brother is being targeted by a gang that exploits homeless people for illegal activities, and because his younger brother wants to quit, he has become a thorn in his side. Huang Wei's grief and anger made him deeply resentful of these wanderers, believing them to be accomplices in his brother's misfortune.

Lin Wanyu and Zhao Yuchen immediately reported this clue to the police. After a series of investigations and evidence collection, driven by this emotion, Huang Wei's car repair shop became a cover for his chivalry. He used his expertise to extract precious metals from the catalytic converters of old cars, which not only brought him income, but also supported his lynching operations. Although it was the metal discovered by the Raman spectrometer that connected him to the crime, what really made him unable to refute was his brother's shabby old coat found in the secret mezzanine of his studio.

On a dark and stormy night, the police surrounded the garage and successfully arrested the murderer. The courage and wisdom of Lin Wanyu and Zhao Yuchen brought this case to an end. The night market has once again restored its former bustle and peace, and the case-handling deeds of these two female police detectives have become legends in the night market.

In the lively night market, a mosaic of life stories unfolds. Each evening is a vibrant tapestry filled with the calls of vendors, the laughter of tourists, and the homeless seeking a corner of warmth. But of late, this tapestry has been stained with drops of crimson, as a spate of murders has disturbed the night market’s calm.

The victims are the night market’s homeless, their deaths shrouded in mystery. The cooking utensils left behind at the scenes beg the question: have these tools, typically used to create culinary delights, been repurposed as deadly weapons? The night market’s dense population and the chaotic blend of blood, food scraps, and refuse have made gathering evidence an arduous task. The investigation trudged on sluggishly until two female police academy graduates, Lin Wanyu and Zhao Yuchen, stepped in to tackle the case.

Lin Wanyu and Zhao Yuchen, not only noted for their striking appearances, are distinguished by their keen instincts and relentless resolve. Committed to unveiling the truth, they went undercover as auctioneers in the night market. With each passing day, they meticulously observed and documented, even risking their lives to draw near to potential suspects. Yet, the truth remained elusive until they employed a cutting-edge tool: a handheld Raman spectrometer.

This device can instantly identify the molecular composition of materials, and in a fortuitous discovery, Lin Wanyu detected traces of palladium, platinum, and rhodium in a trash bin near a crime scene—elements typically found in car catalytic converters, piquing their investigative curiosity.

Their probing led them to Huang Wei, a repair shop owner with a grim history with the homeless. His brother, once ensnared by gambling debts and deceit, had been reduced to street life. Despite Huang Wei’s efforts, his brother met his end in the very night market central to our tale, a death too quickly dismissed by officials as an unfortunate accident amid a territorial squabble, with no homeless person held to account.

Huang Wei rejected this official narrative, convinced that his brother fell prey to a gang that manipulated the homeless for illicit deeds, his desire to escape marking him for elimination. Consumed by sorrow and rage, Huang Wei grew to despise the homeless, seeing them as complicit in his brother’s tragic demise.

Upon connecting these dots, Lin Wanyu and Zhao Yuchen promptly alerted the authorities. Fueled by his emotional turmoil, Huang Wei’s garage had become a facade for his crusade of justice. His skill in extracting precious metals from old catalytic converters not only provided income but also financed his vigilantism. While the metals found by the spectrometer implicated him, it was the discovery of his brother’s worn jacket hidden in his workshop that irrevocably shattered his alibi.

On a night cloaked in darkness and howling winds, the police encircled the garage, apprehending the culprit. The bravery and intellect of Lin Wanyu and Zhao Yuchen brought the investigation to its denouement. The night market returned to its former vibrancy and tranquility, and the heroic exploits of these two detectives became the stuff of legend among its stalls and alleyways.