You Do Need power plug adapter while traveling from North Korea to British Virgin Islands.

Here is Why You Need An Adapter

The outlet and plug type used in British Virgin Islands are A and B 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

British Virgin Islands

In British Virgin Islands, outlets of type A and B are in use.

Type A

Type B