That's exactly what I was thinking.

＊ 상대방 말에 동의하기
   바로 그거야  Exactly /

   아주 정확해 Absolutely correct! /
   바로 그거야  You said it /

  정말 그래(너 그말을 또해도돼!) You can say that again.
  나도 그렇게 생각하고 있어 That's exactly what I was thinking.