All of them are hookers. Girls are come from Thai, mainland China, Taiwan and HongKong. Most of them are pretty young and good looking. If you find good girl, go inside. She will take you to upstairs room, and start their jobs.
System is very simple.
This price is common for all bar in this area. All of them will accept foreigner, and may speak English, except Chinese. I must add this area is open 24 hours, but good girl is appear after 7 PM usually. All the hookers are on display in what it look as Bars. Most of the bars have one girl, some have two.