Professional Killer?

Zhao Yu immediately understood that the person lying unconscious in the room was a dentist in the dental hospital. According to the device, the sisters and the suspect had all come into the dentist's room earlier.

So, what happened here?

Although Zhao Yu was still tracking down the suspect, after some thinking, he figured out an inkling of an idea. He remembered that the dentist's jacket was gone, leaving him wearing a shirt and shorts. Also, he was unconscious in the inner room of the treatment room, while the outer door was shut!

Would it be… The suspect wanted to do something to the doctor, but he ran into the sisters that had just come in coincidentally? Then, he killed them to shut them up?

That can't be right?!

If he wanted to kill them, he didn't have to drag them up to the top of the building, just to throw them down again, right? Isn't that too troublesome? Also, the dentist didn't die!