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

Here is Why You Need An Adapter

The outlet and plug type used in South Korea is F 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

South Korea

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

Type F