Help finding a webtoon

I don’t remember much, i remember the art style being distinct, the female mc had brown long-ish hair and didnt look stereotypically ‘pretty’ there wasnt much if any romance. She joins some sort of organization to solve crimes or similar and i have the association of ‘melody’ being relevant but i dont know why or where - maybe one character was named that. It later turns out that she is suicidal and has a sad past too and the people around her kinda try to help her with that. Anyone know what manhwa/webtoon im talking about?😭