Bridgerton season 4 introduced a new leading lady, Sophie Baek, to the ton with a flurry of new regency language. When the season begins, Sophie (Yerin Ha) works as a maid for her stepmother, Lady Araminta Penwood (Katie Leung), and her two stepsisters. Araminta is initially introduced to Sophie after marrying her biological father, Lord Penwood (Arthur Lee). Lord Penwood succinctly tells his new bride that Sophie is his "ward," careful to avoid using words to convey familial dynamics.