Yerin Ha Photograph by Aurore Marechal/Getty Images [This story contains spoilers for Bridgerton season four, part one.] There's a fairy tale quality to Yerin Ha's casting in the newest season of Bridgerton - and not just because it's based on the story of Cinderella. The recently released fourth outing of Netflix's massively popular Regency romance - adapted from Julia Quinn's best-selling book series - is a twist on the Grimm brothers' fable.