Do they know who he is? Well yes and no.

He gives Gongenzaka a very tired look, brow lifting. Surely the boy has noticed.

"Kid, I am an obviously homeless man, who has been so for a long time, with a criminal record, in a school full of children. Do you see where I'm going with this?" He shakes his head and hands. "But it's fine. You're right. I'll deal with it. Just... don't laugh when they throw me out, okay?"