Yea, I realize that $1 is roughly 1000 ₩ , so when they have to pay like 50,000 ₩ at a coffee shop I can easy see it's about $50.
I don't know which I prefer to see in subtitles, the ₩ amount or $ amount. At least for lower amounts I'm okay with ₩ amounts, but when they start talking in billions and billions I just lose track and it's easier for me to understand in $ terms.