The story is roughly ("1007" case) Qin Yuan was killed by a murderer in an elevator while shopping. He also cut off the elevator surveillance and surveillance outside the elevator. During the forensic autopsy, it was found that there were traces of unknown drug residues in her body. For this reason, the city bureau ran all night to investigate the victim's interpersonal relationship and found that she was a person who did not touch drugs at all. The Criminal Investigation Detachment found nearly a dozen people who had stayed in this mall on the same day, but there were still no clues at all. Later, Yu Feng revealed the most critical point. Through this, the criminal investigation detachment quickly found out the murderer. He Yu was arrested and brought to justice.
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