I'm not sure specifically which '1 5 killer' this refers to. There could be many cases in different regions. Maybe it was a serial killer case where the police had to hunt down the perpetrator through various means like forensic evidence, eyewitness accounts, and following up on leads.
In a general sense, in any 'hunt for a killer' true story, the process is often complex. First, the police need to establish a pattern of the killings if there are multiple victims. They might look at the time, location, and the type of victims. For example, if the victims are all young women in a particular area, they will focus their investigation there. Then, they would use all available resources, such as DNA analysis if possible, to narrow down the suspects. In some cases, the public can also play a role by providing tips based on any suspicious activities they've witnessed.
Well, without more context about this '1 5 killer', it's hard to give a detailed account. However, in many true crime stories, the hunt for the killer involves a lot of legwork. Detectives might have to interview hundreds of people, including friends and family of the victims. They also have to deal with false leads, which can waste a lot of time. Sometimes, new technology or a break in the case, like a sudden confession from an accomplice, can be the turning point in finally catching the killer.
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Chapter 627, "Definitely Not an Accident", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from He looked at the sinister smile lingering in Jiang Li's eyes, then at...
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Chapter 436, "Do You Remember Brother Daniu by Daming Lake?", is the clearest early answer because it turns Sister Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Yu Li took the object that resembled a stone axe and weighed it in...