원통해요 · 원통했어요 · 원통한 (+noun)
to be bitterly resentful (over an injustice), feel wronged
Example
억울하게 누명을 쓰고 감옥에 가다니 정말 원통합니다.
Going to prison on a false charge is truly bitter and unjust.
Word parts
원 grievance+통 pain
Literally 'the pain of being wronged.'