Rough around the edges MLs with criminal pasts who turn their lives around because of a girl, "Man in love" is more of a romantic kind of relationship while "Lighting up the stars" is more of a father-daughter relationship , both slice of life dramas with a lot of deaths in them, both are tearjerkers...and they also have a similar vibe.
Both dramas are about men that have a difficult life and end up taking in a little girl due to unpredictable circumstances. Both are not related to that little girl but by living with the children they change and take on a fatherly role. Both are wonderful heart warming stories about people that meet and become a family.