Really? Better to change at any money changer on Seoul?
I wouldn't say any money changers, but most of them do offer good rates.
The best one is in Myeongdong, 5 minutes walk from Myeongdong MTR, right beside the China Embassy.
It is very well known and you can easily google and find more information on it.
It was mentioned somewhere in this thread as well. If you're changing large sums, I think it's best to make a trip there to change instead of doing it at Arcade, which offers so called the best rate in SG.
I find it really sad that people lose money instantaneously when they change at the Arcade, compared to making a trip to Myeongdong to change.
