문불야관in English:a person who is not able to distinguish between right and wrong

Examples
with 문불야관.

• 그는 문불야관이라서 항상 잘못된 선택을 한다.geuneun munbul-yagwaniraseo hangsang jalmosdoen seontaegeul handa.He is a person who cannot distinguish right from wrong, so he always makes the wrong choices.