Who plays Sophie Baek in Bridgerton Season 4? All about new lead actor Yerin Ha Bridgerton Season 4 Part 1 is now streaming on Netflix. Read on to know more about Yerin Ha, who plays the role of Sophie Baek in this season. Who plays Sophie Baek in Bridgerton Season 4? Yerin Ha plays the love interest of Benedict Bridgerton (Luke Thompson) in Bridgerton Season 4.