Responses
http://www.mangago.zone/read-manga/ore_no_ushiro_ni_tatsu_na/
Idk if this is it, but it's kind of similar
Yes! Tyvm!
So there’s a manga I once read and it was about an ex-policeman who now worked at his family’s store and someone who was a kid at the time in high school he helped while he was a policeman stayed in touch with him and became a policeman himself when he was older and they fall in love with each other