마이동풍이 · 마이동풍을
in one ear and out the other; turning a deaf ear
Example
아무리 충고해도 그 사람에게는 마이동풍이에요.
No matter how much advice you give him, it goes in one ear and out the other.
Word parts
마 horse+이 ear+동 east+풍 wind
Literally 'an east wind blowing past a horse's ear'; the horse doesn't care.
Good to know
Native equivalent: 쇠귀에 경 읽기 'reading scripture into a cow's ear.'
Related words