They cut a really nice scene in this chap 158. It's there in that website.
They notice that the car has been there for a long time and siyoon knocks on the window but they can't see inside the tinted windows that there's a person inside.
Then FL picks up a rock to break the car's window just cuz she trusts Siyoon's hunch lmao. That scene was so funny cuz it shows she is almost as crazy as Siyoon