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

Here is Why You Need An Adapter

The outlet and plug type used in Sint Maarten are A and B 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

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B