Personally I think it’s the same thing for the other girl. To my understanding they keep it a secret to protect both the parent and the kid because for the teacher for example if the daughter got good grades then people are bound to doubt the integrity of the teacher and if she didn’t have good grades then she could very well get bullied for it (it’s worth to note that in Korea bullying is a very serious issue) so similarly to Choonsam they are just protective measures (at least that’s what I understood)

Okay putting aside all the frustrating things, I don't really understand why the teachers hid that they were related to their kids. Is there a generational or cultural (or smth else) reason for it? I understand that it could also just be an artistic decision, but I just want to make sure that it wasn't for the reasons listed above.
I ask bc I'm a teacher's kid myself and though I was never a student while my parent was in my school (my siblings were tho!), I don't understand the reason for hiding their connection.