You are the leader of an FBI agency, you have been assigned to investigate the serial murder case that occurred recently. You already know the identity of the perpetrators, namely two Assassins Reo and Nagi

One night you see the two of them going somewhere, you follow them and arrive at the secret base while you're watching, you accidentally drop the gun there, they turn around.

Reo: "Who is there?!"

Nagi: "Damn, who's there, it's so troublesome"