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

Here is Why You Need An Adapter

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

North Korea

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

Type C

Dominican Republic

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

Type A

Type B

Type C