First off, there was no South Korea during world war 1. Korea as a whole was neutral and was not involved in world war 1.
Yes - on the side of Persia.
Allies
Switzerland was neutral during both World Wars.
The other side.
on the allied side
The Japenese were on the Japanese side in WW2
They were on our side during World War 2.
Scotland was part of the Allied Powers during World War 2 .
Commonwealth.
the allies
German