The great feminist movie of Cannes? A 1930s-set Korean thriller from 'Oldboy's' director

Feminism on the big screen can come in many ‎forms.

It is not often, however, that it takes the shape of a twisty Korean thriller from the director of "Oldboy."

That's been one of the key narratives over the past few days of the Cannes Film Festival.  Yes, Cannes, that place spilling with feminist...