Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Upon receiving this information, Wang Shuai immediately checked Zheng Kailan's information through the household registration system and quickly found her detailed address and contact information. Wang Shuai dialed Zheng Kailan's number. After the call connected, he first identified himself and then carefully informed her of Zheng Kaibin's death. There was a long silence on the other end of the line, followed by a suppressed sob.

“My brother… how could he suddenly have an accident? I called him just two weeks ago, and he said everything was fine…” Zheng Kailan’s voice was thick with disbelief and grief. After calming her down, Wang Shuai asked if it would be convenient for her to come to the Municipal Criminal Investigation Detachment to cooperate with the investigation and undergo DNA comparison to ultimately confirm the deceased’s identity. Zheng Kailan said she would leave immediately and arrive that afternoon.

At 3 PM, Zheng Kailan arrived at the Criminal Investigation Detachment. She appeared to be in her forties, dressed simply, with red and swollen eyes, clearly having cried all the way there. Zhang Kai had already prepared for DNA sampling. He gently explained the situation to Zheng Kailan, then collected her blood sample, which was sent to the technical department for DNA comparison. While waiting for the comparison results, Wang Shuai arranged for his team to conduct a detailed interrogation of Zheng Kailan.

Inquiries revealed that Zheng Kaibin, 40 years old, is a local resident. His parents passed away early, and he has only one older sister, Zheng Kailan. After graduating from university, Zheng Kaibin worked for a foreign trade company, but later resigned to start his own business, opening a small foreign trade consulting firm that primarily handles foreign trade business for small and medium-sized enterprises. He is introverted, not good at socializing, and has always been single, living alone in the Sunshine Garden residential complex.

“My brother was a very kind person, he didn’t have any enemies,” Zheng Kailan said, sobbing. “He was very principled in business and never had any disputes with customers. Although we siblings live in different cities, we keep in touch often. I called him two weeks ago, and he said that business at his company was doing well, just a bit busy, and told me not to worry. I never imagined that he would be suddenly murdered…”

Wang Shuai asked, "When was the last time you contacted him? What did you talk about? Did you notice anything unusual about him? For example, was he depressed, mentioned having trouble, or made any new friends?"

Zheng Kailan recalled carefully: "The last time we contacted each other was 14 days ago, on November 5th. It was a weekend, and I called him to ask if he wanted to go back to his hometown. He said he had a project to follow up on at the company and couldn't leave. He would go back after he finished this busy period. His tone was normal, nothing unusual, and he didn't mention any trouble. He doesn't have many friends. Apart from his work colleagues, he has almost no personal friends, and I've never heard of him having a girlfriend."

"Where is his company located? Which clients does he mainly work with? Does he have any close colleagues or partners?" Wang Shuai continued to ask.

“His company is on the 15th floor of the Global Building in the city center. It’s called ‘Qihang Foreign Trade Consulting Co., Ltd.’ It’s not a big company; there are only three people in total, including him. I don’t know exactly which clients he works with, as he rarely talks to me about the details of his work. I only know that he has two employees: one is a young woman who recently graduated, and the other is a former colleague who started the business with him. I’ve forgotten her name, but I think her surname is Zhao,” Zheng Kailan replied.

That evening, the technical department delivered the DNA comparison results: Zheng Kailan's DNA profile matched that of the deceased, and combined with previous medical records and characteristic comparisons, it was finally confirmed that the deceased was Zheng Kaibin. This result brought a sigh of relief to everyone involved in the case investigation. The mystery of the deceased's identity, which had plagued everyone for more than ten days, was finally solved, and the case investigation finally took a turn for the better.

The next morning, Lu Chuan convened another case progress meeting, at which a new direction for the investigation was clarified: focusing on the interpersonal relationships of the deceased Zheng Kaibin, a comprehensive investigation was conducted on his relatives, friends, classmates, colleagues, business partners, etc., with a focus on finding people who had conflicts or disputes with Zheng Kaibin or had unusual economic dealings. At the same time, based on the information from the previous crime scene investigation, the suspects were identified.

"Wang Shuai, you will lead a team to investigate Zheng Kaibin's company, examine his colleagues and business partners, verify his company's operations and financial transactions, and see if there are any grudges arising from business disputes or economic problems," Lu Chuan instructed. "Yang Lin and Yang Sen, you are responsible for investigating Zheng Kaibin's social relationships, including his classmates, friends, and neighbors, to understand his daily life, personality traits, and whether he has any emotional disputes. Zhang Kai, your forensic department will continue to conduct in-depth examinations of the physical evidence collected at the scene, especially the fingerprints and fiber samples on the dagger, to see if they can be linked to the people identified."

After the mission was assigned, each team immediately began operations. Wang Shuai led his team to Zheng Kaibin's Qihang Foreign Trade Consulting Co., Ltd. The company's office area on the 15th floor of the Global Building was locked. Wang Shuai contacted the building's security personnel through the property management and used a spare key to open the company's door. The office area was small, about 50 square meters, divided into three cubicles: Zheng Kaibin's office and two employees' workstations.

The office was clean and orderly. Zheng Kaibin's desk was furnished with office supplies such as a computer, printer, and filing cabinets. The filing cabinets contained the company's business contracts, financial statements, and other documents. The team members immediately conducted a thorough search of the office area, focusing on whether there were any clues related to the case, such as suspicious letters, IOUs, or contract dispute agreements.

"Team Leader Wang, here's an incomplete contract. Party A is a small garment factory in this city, and Party B is Qihang Company. The contract amount is 15 yuan, and it was signed a month ago. It has Zheng Kaibin's signature on it, but Party A hasn't signed and stamped it yet." Investigator Xiao Chen found a contract in Zheng Kaibin's filing cabinet. Wang Shuai took the contract and examined it carefully. The contract was a service agreement for garment export foreign trade consulting, which stipulated the service period, payment method, and other terms. No obvious abnormalities were found.

Subsequently, the team members found the company's financial statements. Upon review, they discovered that Qihang Company's operations over the past six months had been relatively stable, without any significant losses. However, several accounts receivable remained uncollected, the largest being a 20 yuan consulting fee from a crafts company in a neighboring city, which had been overdue for three months. The financial statements also recorded the company's employee salary payments; both employees' salaries were paid on time, with no arrears.

"Let's contact these two employees first to understand the company's specific situation and Zheng Kaibin's recent status," Wang Shuai said. Through the company's employee files, the team found the contact information for two employees: one was Li Mengmeng, 23 years old, who had just graduated a year ago; the other was Zhao Wei, 38 years old, Zheng Kaibin's former colleague and one of the company's partners. (End of Chapter)