You Do Need power plug adapter while traveling from South Korea to Liberia.

Here is Why You Need An Adapter

The outlet and plug type used in Liberia are A, B, C and F and in South Korea is F. This is how they look like.

South Korea

In South Korea, outlets of type F are in use.

Type F

Liberia

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

Type A

Type B

Type C

Type F