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[Traditional criminal investigation + suspense reasoning + serial murder + hard core] New Year's Day, 2020, early morning. A gunshot broke the silence. Interpol Han Jiang received a report from the masses that a fugitive from a traffic accident appeared in an unfinished building by the river. During the chase, he discovered that the criminal was armed with a gun. So he shot without hesitation. But he accidentally injured the girl Zhu Xiaoyu who was on the rooftop. When questioned, Han Jiang said: "I am enforcing the law! The other party has a gun!" The captain snapped: "We searched the whole building today and couldn't find the gun you mentioned!" Han Jiang was forced to start a gun-hunting journey. What secret does this missing gun hide? Why did Zhu Xiaoyu happen to be on the rooftop that night? Why was she, a girl, going to an empty building? Watch the lonely police detective peel off the cocoon and uncover the shocking truth behind the traffic accident case!