등하불명이에요 · 등하불명이라더니
it's darkest under the lamp; missing what's right under one's nose
Example
등하불명이라더니 안경이 바로 책상 위에 있었네요.
Talk about missing what's right in front of you — my glasses were right on the desk.
Word parts
등 lamp+하 under+불 not+명 bright
Literally 'under the lamp it isn't bright.'
Good to know
The native proverb 등잔 밑이 어둡다 means the same and is more common in everyday speech.