ผู้ร้าย

He is exactly the culprit and the root cause.

I just figured it out. That is exactly the culprit's weakness.

Since he is the root cause, he is exactly the culprit.

This is exactly the hint about the culprit's weakness.

The detective found a clue, but he still cannot figure out who the culprit is.

The judge decided to punish the culprit severely.

The witness was forced by the culprit to distort the truth and conceal the evidence.

The police managed to rescue the situation successfully because the criminal did not resist.

The criminal resisted and used a gun grazing his head, but the police managed to dodge and survive.

That criminal claimed to be a doctor in order to deceive the public.