i'm watching episode 9 and i just thought it wouldn't make sense for the mysterious murderer to be chiyeol's assistant because he would've got rid of sua's mom a long time ago (assuming the victims are targeted for being chiyeol's enemies)
So these moms have nothing to do but talk about grades and how they can hurt another student they don't like.
it's unfortunately not as uncommon as some may think. however, they're usually not as straightforward in expressing their hatred, they beat around the bush...