Champagne and roses if you haven’t already
Russian mafia x Lawyer
Or crush and burn
They both have questionable parts but what else do you expect from killer tropes
Wouldn't call it innocent lover but as far as killer lover troupe goes I only remember this one
https://www.mangago.zone/read-manga/itou_san_kuraka_sui/
Cause I really liked this.
And probably Red Candy but that's probably not innocent lover you're looking for.
Kimi no yoru ni fureru
Assassin who can’t kill x blind young man!
Art is so good, + unique characters n good relationship build up
I want a killer with an innocent lover bl trope