You Do Need power plug adapter while traveling from Dominican Republic to North Korea.

Here is Why You Need An Adapter

The outlet and plug type used in North Korea is C and in Dominican Republic are A, B and C. This is how they look like.

Dominican Republic

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C

North Korea

In North Korea, outlets of type C are in use.

Type C