The moment they switch to 반말 — what just happened between them
Korean grammar forces a choice about the listener in every sentence. Dropping the polite ending either lets someone in or insults them, and English subtitles show neither.
banmal
“Gosaenghaesseo” (고생했어) — why “good job” isn’t what he said
The subtitle says “Good job.” The word literally means “you did bitter living,” and it says nothing at all about whether you succeeded. That gap explains a lot of crying scenes.