I feel like I've seen a clip on this, let me check!
Is it angry mom or stakeout
Is it 'Angry mom'?
i dont rember i just know she was trained for it
like they played it off like she was going back to school but really she was there to epose hat was going on
You can look it up on Google as bullying themed kdrama
Still can't find it it was on dramafever when I saw it
Ik this has nothing to with manga but there was a Korean drama I saw years ago about a women who goes undercover as a student to expose the bullying and stuff that happens there and in the first episode she exposes a girl who cuts herself by showing the parents