The suspect left behind two crime scenes.
One was the residence of the burned victim, and the other was the room rented by the murderer to observe the victim's residence.
The room that had burned was inevitably limited in what could be investigated, so Jiang Yuan chose to inspect the room rented by the murderer first.
There were still some things in this room. After all, even though the murderer made some preparations, he was forced to leave and inevitably left behind some items, including traces of daily life.
If it were an ordinary suspect, with these items, it would be easy to determine their identity, and then it would just be a typical pursuit and capture operation. There was no need for an expert of Jiang Yuan's caliber to be involved.
