Gi-hun Running into Sae-byeok was Improvised
On the show, Sae-byeok was a passerby that bumped into Gi-hun and fell. And at the moment she fell, she dropped her iced coffee, and Gi-hun rushed to grab it and give it back to her in what became an awkward and somewhat amusing moment. It turns out that this scene was improvised and if you take a closer look, you’ll be able to see Sae-byeok’s shoulder shaking because she’s laughing and trying to hide her face while she laughs.