You Do Need power plug adapter while traveling from Vatican City to North Korea.

Here is Why You Need An Adapter

The outlet and plug type used in North Korea is C and in Vatican City are C, F and L. This is how they look like.

Vatican City

In Vatican City, outlets of type C, F and L are in use.

Type C

Type F

Type L

North Korea

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

Type C