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

Here is Why You Need An Adapter

The outlet and plug type used in South Korea is F and in Botswana are D and G. This is how they look like.

Botswana

In Botswana, outlets of type D and G are in use.

Type D

Type G

South Korea

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

Type F