Yerin Ha joins Backstage to discuss her breakout role as Sophie Baek on “Bridgerton” Season 4, based on Julia Quinn’s book “An Offer From a Gentleman.” The Australian actor talks about building a British accent with a dialect coach, booking the role through self-tapes and virtual callbacks, and what it was like joining an established cast. She also shares how costumes shaped her performance, how intimacy coordination supported her first onscreen intimate scenes, and what she learned about the craft from both drama school and set life.