To say “happy ending”, would you say “final feliz” or “fin feliz”?

(Just so we’re clear, I’m not talking about a “happy ending” that one might get after a massage jajajaja)

I had always thought that end/ending was “fin”, so to say “I love a happy ending” I would say “me encanta un fin feliz”. But in the song “Vuelve” by ChocQuibTown, they say “no tuviste un final feliz”. Is “fin feliz” incorrect? Thanks!