Not a fan of the romance tag but I guess I'll just keep it as a father/daughter situation (with the daughter having a father complex) in my head until they make it way too blatant.
Just readjust read https://mangadex.org/title/41243/the-story-of-a-terrifying-hitman-and-a-little-girl
For same premise with father/daughter bent.
Have this one be romance and the other familial.