Amybal wrote:HI, is this line correct?
A love story between a human and a supernatural creature
It is correct grammatically although it needs a full stop at the end but it's not really a move tagline.
A tagline s a short pithy phrase that sums up the essence of a film without describing it too much.
Some examples:
Alien: "In space no one can hear you scream."
Boogie Nights: "Everyone has that one special thing."
Jaws: "You'll never go in the water again."
They are meant to intrigue you and make you want to find out about the film, but not tell you what it's about.
I lack the imagination for a witty signature.