You Do Need power plug adapter while traveling from North Korea to Isle of Man.

Here is Why You Need An Adapter

The outlet and plug type used in Isle of Man are C and G 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

Isle of Man

In Isle of Man, outlets of type C and G are in use.

Type C

Type G