I remember watching an MV years ago but I can't remember the title of the song...

It's about an assassin (a girl) who killed a guy but finds out that he has a daughter. She then gives the daughter a ride and they go closer over time. I think the assassin teaches the daughter how to drive her car? In the end, the assassin shoots herself. 

If anyone thinks they might know the song and could comment it down below, I would greatly appreciate it...

Thanks!