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

Here is Why You Need An Adapter

The outlet and plug type used in Bangladesh are A, C, D, G and K 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

Bangladesh

In Bangladesh, outlets of type A, C, D, G and K are in use.

Type A

Type C

Type D

Type G

Type K