I changed sgd to usd at the arcade then to won in myeongdong and it is better to change usd.
Highest rate ytd was
1sgd=109won
1usd=1022won
The rate I changed at arcade for USD was 1.253sgd=1usd
Therefore if we use sgd to usd then to won
The rate is around 815
Given by 1022won/1.253=815
If want to change, look out for the Chinese ambassy which is a money changer behind Noon mall..there is a stretch of money changer and just look around..there is one call DA SHI Guan and one more below which give a higher sgd rate..the rest of the money charger are crap