Could it be… He is the murderer?!
Zhao Yu had never expected to see such an unbelievable scene in the surveillance record from the robot. When he had rewound the tape, the robot's camera angle just happened to record a partial view of the corridor, which allowed Zhao Yu to see half of the plain-clothed policeman's body!
However, what shocked him the most was that, although the video only captured half of his body, Zhao Yu could clearly see that the policeman was carrying a red fire extinguisher! At first glance, there didn't seem to be anything unusual about the scene. But, when looking at it more carefully, it obviously didn't make sense. This was because, according to the timing, the rubbish bin on the ninth floor hadn't yet caught fire.
In other words, the policemen would not have known that the rubbish bin was going to be lit on fire, as the fire wasn't set until a few seconds later.