Netflix has unveiled Yerin Ha as Sophie Baek, the love interest of Benedict Bridgerton, in the fourth season of 'Bridgerton'. Sophie, originally named Sophie Beckett in Julia Quinn's novels, has been renamed to reflect Ha's Korean heritage. Sophie, a maid with a mysterious past, meets Benedict at a masquerade ball, leading to a Cinderella-like storyline. Ha's casting and the name change were partly her decision, aiming to make the role more personal. This season will continue to explore Benedict's fluidity in relationships and his journey toward love, following the book 'An Offer from a Gentleman'.