I HAVE FIGURED OUT @SYSTEM'S IDENTITY!!
Well, it's simple, really.
SPOILER: YOUR IMAGINATIONS ARE ABOUT TO BE RUINED
Okay! So, System i just THT undercover. @system may be evil to you, but Think again. Liza is there. Rodrigo works there with Liza. All other members of THT are behind system. Think about it! System could be all of them, or just an Artificial-Intelligent robot inside the computer. One of my big ideas, is that i think @system could be an account that stays on all the time, and Liza or someone else who is behind system could just go to a topic and close it(which is really all that @system does).
I hope you enjoyed reading this topic >:DD