Wen Shuangshuang didn't plan to hire any private detective. There really isn't a private detective industry in the country; even those operating covertly have questionable professional ethics. If they accidentally leak a client's information to the subject of the investigation, it's just shooting oneself in the foot.
Wen Shuangshuang decided to learn some hacker skills. In today's society, everyone's mobile phone is like a mini-computer. In the eyes of top hackers, these phones are individual surveillance devices, able to track a person's whereabouts at any time, much more useful and safer than private detectives.
Moreover, this world has very advanced surveillance systems, installed both secretly and openly everywhere. On the streets by the government, at the doorsteps of private residences and business fronts, everyone has become accustomed to monitoring.
