일껏 ~았/었는데 · 일껏 준비하다
taking all the trouble (only to be disappointed), with great effort
Example
일껏 음식을 준비했는데 아무도 오지 않았어요.
I went to all the trouble of making food, but nobody came.
Word parts
Usually sets up a letdown: 일껏 ~했는데 = went to all that trouble, but...