You Do Need power plug adapter while traveling from San Marino to North Korea.

Here is Why You Need An Adapter

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

San Marino

In San Marino, 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