Studio Zazac

Dujung, an elementary school student, goes to a farm in the suburbs with his parents. While his parents believe the expensive and rare specialty from the farm will strengthen their son's body, Dujung suffers side effects.

A father and a son both have the same big birthmark on their butt. Believing that the two birthmarks are connected, the son scrubs his father's birthmark to remove it—but he just can't get rid of it.