Don’t require power plug adapter while traveling from Guinea-Bissau to South Korea.

Here's why you do not need an adapter

The outlet and plug type used in South Korea is F and in Guinea-Bissau is C and they are compatible with each other.

Guinea-Bissau

In Guinea-Bissau, outlets of type C are in use.

Type C

South Korea

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

Type F