Circus/BOne are arguably hottest clubs in Itaewon. Miro and Mute are my other favorites. Clubbers are in mid 20s/30s and most people are open to English speakers. And girls are hot. Go there after 11 on Thu/Fri/Sat. Before that it's almost waste of time. BOne is just a bar in early evenings but it turns crazyyyyy at midnight. Price is only 10,000 won ($10). And try Mojito at Circus. It is pretty good!