I read this series manga or webtoon back a few years back.
I do remember a couple scenes about it. I remember it’s a romance between a girl who is in college (I believe) and a guy who is a bit older. He has a scar on his back or leg from an injury, the FL saw it when he wore a tank top/shorts while cleaning. I do remember a part of drama that he had an ex fiancé, they argued, and she was giving her engagement ring back. It was thrown and the FL picked up the ring and kept it with her. He goes visit her in the college campus and whatnot. I believe this series is colored and the guy had possible orangish hair / light colored hair maybe—(?)

I believe the series is completed.

Thanks and sorry for the bad description.