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The most feared aspect of handling a murder case is the lack of clues.
As long as there are clues, there is no shortage of manpower.
For instance, if someone commits a mass shooting and then flees to the mountains, the local authorities can organize a search team of thousands within minutes.
Many murder case task forces organize massive searches, at times, just to make full use of the available human resources. Whether it's sufficient or necessary, at least it keeps the task force members busy.
Having nothing to do is a huge blow to the morale of the task force.
After Jiang Yuan submitted the clues, the task force for the 724 Qinghe major homicide case started their investigation work overnight.
An 18-year-old is likely to be a senior in high school or a college freshman, and being a ballet student suggests a well-off family background, so the victim was probably still a student.