That person in missing paper, who?

the guy who was tied up and alive in the bedroom while MC fucked with the killer

That person who wants the blind guy to tell his mother that he loves her, 11 or 12 chap?

I'm pretty sure it's the dude that tried to ask the protagonist for help before he died. I'm pretty sure the woman that was putting up the fliers was the victim's mother who he told the protag to tell that he loved before he died.
Idk if that made any sense at all

yep

yep its that one

Okayy, thanks you all~