A call-back to the first episode
In the previous episode of Squid Game, Gi-hun asked the banker if he could borrow 10,000 won (around 8 dollars).
That recalls the first episode when Gi-hun did the same to the loan shark who had just beaten him. Ironically, he didn’t receive any money when he most needed it in that episode because he had billions of won in his bank account at that moment.