You Do Need power plug adapter while traveling from South Korea to Western Sahara.

Here is Why You Need An Adapter

The outlet and plug type used in Western Sahara are C and E and in South Korea is F. This is how they look like.

South Korea

In South Korea, outlets of type F are in use.

Type F

Western Sahara

In Western Sahara, outlets of type C and E are in use.

Type C

Type E