理に勝って非に落ちる
Meanings
1
to lose an argument despite being in the right; to have right on one's side but still lose
Proverb-like expression describing a situation where logic or justice is on one's side, but one still ends up losing or being defeated in a dispute. Often used to lament the gap between principle and outcome.
In court, you can sometimes lose even when you are in the right.
He made a valid argument, but ended up losing despite being right.