Maybe the dude is from a (dollar) millionaire family and that's why the girl is interested. If the billions of yens belong to his mother, not father, that's why the father is still married, despite all the cheating.
It's depends.
If it's one or two it's called cat teeth and it's mean to be cute and generally a air head character.
Shark teeth generally are associated with characters that are seems as scary/delinquent.
It's the same thing with cat ears, a character that appears with cat ears don't literally have cat ears.