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

Here is Why You Need An Adapter

The outlet and plug type used in Laos are A, B, C, E and F 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

Laos

In Laos, outlets of type A, B, C, E and F are in use.

Type A

Type B

Type C

Type E

Type F