The lobby, corridors, and elevators of this hotel cannot be without surveillance. Even if there is no surveillance in the hotel, there must be surveillance in the nearby streets.
There is a record of the phone answering the phone, which can be checked when and where it is answered. Although there is no witness, these indirect physical evidence still exists.
Regarding the gun, although the male protagonist did not kill, the murderer did. There were fingerprints on the bullets inside.
The kidnapped had a simple fight with the murderer, the heroine also tore at close range with the murderer, and the sheets torn by the murderer must have skin DNA on it, and the door handles that close and open the door also have the murderer's fingerprints on them.
At the time of the shooting, someone called and heard the sound of gunfire. At this time, the male protagonist drove into the hotel, indicating that he was not present at the time, and the time period was not allowed.
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