At the Murder Scene, a Prompt Box Floated Above the Deceased's Head

[Partial system + crime solving + city] Three months after joining the company, Gu Bei, a trace inspection intern, was inspecting the scene of a hanging and saw a line of blood-red words appearing out of thin air above the deceased's head: [She was not tied up]. Relying on this strange reminder, Gu Bei used his trace inspection knowledge to restore the scene and expose the truth about the fake suicide. Immediately afterwards, the "fallen down twice" on the face of the deceased at the car accident scene, and the "died before fire" on the scorched corpse at the fire scene... The disguise of a perfect crime was torn apart again and again! But when he put together three cases with different motives and the murderer was arrested, a fourth label floated above his notebook: [More than one]. The same place where the crime occurred, the ever-shortening intervals between crimes, and the cross numbers hidden in the communication records all point to the same mysterious neighbor who has had phone calls with all the murderers... When the disguise of the serial killing bureau was broken, a pair of eyes hidden behind the scenes also stared at Gu Bei. Who will be next to be labeled with death?