Korean Public School Cafeteria Talk

I do not generally like to disparage my school or coworkers (because they are amazing), but I thought there were some good lines in this latest text to type video by a disgruntled NEST lampooning Korean absurdities.

One of my top complaints of working in a Korean public school are mandatory school events that require me to stay past 4:30 and nobody tells me about them about them until the day of.  Sometimes it is a volleyball game.  Sometimes it is a staff retreat.  Sometimes it is a welcome dinner.  Regardless, I can NEVER get my coteachers to tell me when these will happen until the day they happen.

Now, I am not married, but I have a girlfriend and friends and frequently do have plans in my evenings.  I do not have kids, but someday I might and many of my coworkers do.  How can it be that "Korean culture" includes planning staff dinners and retreats that require mandatory unpaid overtime and nobody is allowed to know about them until the day of?  It is infuriating...