Walter D. is right.
Currently it's 10,000 won minimum bet, BJ payout is 15,000 won in chips.
Roughly the exchange rate is 10,000 won = $10 US

Years back there was a 500 won chip.
The casino in Walker Hill hotel was named Continental Club at the time.

There was a 100 won chip also.

I don't know how these chips were used.
I haven't seen a 250 chip from South Korea casinos.

Happy Holidays!