소탐대실이 · 소탐대실을
penny-wise and pound-foolish; losing big by chasing small gains
Example
싼 제품만 고르다가 돈을 더 쓰게 되면 소탐대실이에요.
If you only pick cheap products and end up spending more, that's penny-wise and pound-foolish.
Word parts
소 small+탐 covet+대 big+실 lose
Literally 'covet the small, lose the big.'