Hello! I'm looking for a manga about a man and his relationship with a young girl he's adopted. He knew her mother (and there are flashbacks to her mother when she was alive. She smokes when they're in high school). His relationship with the girl and her mother seem very complicated. There are also flashbacks (or flashfowards?) to when the girl is a teenager/almost a woman. Another major character is this boy the girl meets when she's young. He's a typical boy, I think (if that makes sense).

The first chapter is of the girl is grown up/teenager. She is leaving the man's house that she grew up in and the boy comes to pick her up.

The story really focuses on the girl and how she's very girly and becomes more precocious as she grows older.

The biggest clue I can give is that the style of drawing is very similar to LEE Hyeon-Sook (illustrator of Savage Garden, Flowers of Evil, etc.)

Is it Nocturne (PARK Eun-Ah)?

That's the manga! Thank you so much x))