Life and death are uncertain, and you can't see the living person or the dead body (as long as G?sh? Aoyama doesn't talk, you can't judge his identity for the time being).

Water without cold resistance

The CIA undercover good people who infiltrated black organizations are also providing information to the FBI for some reason.

Central Intelligence Agency (CIA)

It's the central intelligence agency.

If you like, you can read comics and explain.