A : What's the date today?
  -오늘이 며칠이죠?

B : It's June 4.
   -6월 4일인데.

A : Oh, my God. I completely forgot my mom's birthday.
   -어쩜 좋아. 엄마 생일을 까맣게 있었어.

B : Why don't you hold her surprise party?
    -써프라이즈 파티를 해드려.