Jongwoo:

He doesn't like it! Stop iiitt! He has plenty of people making him think ominous stuff will happen, you, unprompted, saying 'that's a good last notebook to write in' and 'this room might be small but at least won't ever have to worry about such things in a few months ago' is TERRIFYING and makes him double think EVERYTHING!

Are you in on this shit?! Do you know something?! Why won't he have to worry again?! Why is it his last notebook?! And the fact you don't properly explain afterwards makes it worse because then he lays awake thinking you must be in on it!

Moonjo:

You would make a nice addition to the building, that's for sure. Jongwoo would hate you. And so Moonjo loves you.

When you begin being ominous it's a puzzle for him to have fun with. To piece together why you say this, and with what intent. Old people have crossword puzzles, he has you.

Junghwa:

Her worst nightmare. Daily heart attacks.

"This was a good last breakfast to have."

"W-wae? Are you planning something? Is someone after you?!"

You make her constantly think you are gonna die, that there is danger, and/or you are a witness to something you shouldn't speak of but are trying to hint to. As a cop her job is to find clues, so this stuff makes her read waaay too much into it.