Ok so I definitely feel like doha knows more about the game then he's telling bada because...

Ok so I definitely feel like doha knows more about the game then he's telling bada because how did he know that secret space was there in the wall? I dont remember that in previous chapters. I think maybe he's erasing bada's memory with his tape when something bad happens. I'm pretty sure the two tapes in the bag are doha's and the blue haired guys or bada's and the blue haired guy. Maybe the check on the tape means that he knows he can erase that players memory