Thoughts while watching Shim Soo-bong

I know I've written something similar before, but I believe one of the standards of being an adult is
the ability to pretend you don't know something, even when you have something to say.
Because as I live my life, I've realized that what I know, others usually know too. They just choose not to speak up... simply out of consideration for that person.
Even if you want to act like you know or offer unsolicited advice, you just let it pass. It might be because of a lack of interest, but people definitely learn things as they live through life.
I can't help but think there was no need to lash out like that..