It serves you right!
그것 쌤통이다!

May : You know， John! I like your mother. She is one of a kind.
John : May， it's not funny. Stop teasing!
May : It serves you right. I agree with her.
John : You mean， you want me to go away to the army?
May : Well， everyone does it. Don't they?
John : Yeah， you can say that because YOU don't have to go.

* ~ is one of a kind : 어떤 종류에 하나 뿐인 - 드물다， 유별나다， 색다르다.
* It serves you right. : 자업자득， 쌤통이다.
* Stop teasing. : 'tease'는 놀리다 의 뜻.
* go away : 가버리다， 떠나다