"W-AH-s-sorry!!"
For reference, Katsuki DID know Peter was living there and he WAS a guest-he just generally didn't acknowledge Peter's presence/ignored him
".......Is Ren still here..?"
Renny was making a plan- cause he had no clue that Katsuki knew Peter was there- Ren started stacking the bricks on the glass table, once he had put about..7..he pushed off one of the bricks, making the glass table shatter. Katsuki heard it cause it was..pretty-pretty loud.