Zhou Wei was from a top hacker family. She had the talent in this area and was very cautious in doing things.
The technical department's inspection and surveillance cameras weren't able to find anything useful for the investigation.
Liao Xu only discovered that the surveillance cameras had been hacked after looking through them a second time. His abilities were decent, and after discovering this vulnerability, he immediately tried to recover the surveillance cameras' data.
However, Zhou Wei was very careful in doing things. Liao Xu looked through the footage of several surveillance cameras but still found no evidence.
It was only when he checked the surveillance footage for the side door of the technical department that he found a piece of evidence.
The picture was taken very clearly.