You will be sorry if you don't pay me back!
 →돈안갚으면 재미없을줄 알아!!

You will be sorry if you don't ~ :네가 ~하지않으면 재미없을줄알아!

〔예문〕

A :Hony,this is your fourth you're taking the bar exam!
   You have to pass it this time!
   여보,이번에 당신네번째 사법고시 도전이예요!
   이번엔 꼭 붙어야해요!

B : I'll try my best.
    최선을 다하겟소.

A:You will be sorry if you don't pass the exam this time!
   이번에도 떨어지면 재미없을줄알아요!