Another coin laundry chain is the following:

http://www.cleanup24.co.kr/chain/chain_07.php

One funny thing to check is to confirm if the washer automatically dispenses laundry soap. One of the places I used, I did not realize that the soap was automatically dispensed internally - there was no need to add. I did not know, so added my own soap. To say their was an excess of suds would be an understatement.