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‘Bridgerton’ Season 4 fans, here's your cast guide as Netflix hit show adds Harry Potter alum

A masked ball, a hidden romance, and a powerful new family set the stage as ‘Bridgerton’ Season 4 returns with secrets waiting to spill.

Netflix drops ‘Bridgerton’ Season 4 on January 29, but the story will not arrive all at once. Patience will be tested. The streamer is rolling out the season in two parts. Part 1 includes Episodes 1-4 and lands first. Part 2, featuring Episodes 5 through 8, follows a month later on February 26, as per The Economic Times. This season shifts the romantic spotlight toward Benedict Bridgerton (Luke Thompson). He’s the second son who has spent previous seasons drifting between art and flirtation. Interestingly, Season 4 introduces a fresh household into London’s upper circles. The Gun and Li family make their entrance during the now-famous ‘Bridgerton’ masquerade ball. 

And the main protagonist’s (Sophie Baek) connection to this family is complicated. She lives under their roof, but not as an equal. Employed as a maid, Sophie’s days revolve around chores, orders, and expectations she didn’t choose. The season draws inspiration from Julia Quinn’s novel ‘An Offer from a Gentleman’, which reimagines the Cinderella story. Yerin Ha steps into the role of Sophie, according to News18. Born in Sydney, the Korean-Australian actress trained at the National Institute of Dramatic Art. Before ‘Bridgerton’, Ha appeared in Netflix’s Australian thriller ‘The Survivors’, which became one of the platform’s most-watched series toward the end of 2025.

She’s also familiar to genre fans from ‘Halo’, where she played Kwan Ha, and has spent time on stage with the Sydney Theatre Company. Sophie’s life under the Gun and Li household is anything but gentle. Lady Araminta Gun, portrayed by Katie Leung, is a woman dressed in black and driven by ambition. Twice widowed, Araminta sees society as a ladder and intends to climb it using her daughters as leverage. Araminta’s eyes are firmly fixed on the Bridgertons, whom she views as the perfect gateway to power and status. If alliances must be forced, so be it. Many still remember her as Cho Chang from the ‘Harry Potter’ films, but she’s since built a résumé filled with many TV roles. 

They include ‘One Child’, ‘Strangers’, ‘Annika’, and ‘The Peripheral’. Animation fans also know her voice as Caitlyn Kiramman in Netflix’s ‘Arcane’. Michelle Mao plays Rosamund Li, Araminta’s eldest daughter, and her clear favorite. Rosamund moves through society with beauty and a sense of entitlement. She is just like her mother, treating Sophie less like a person and more like furniture. Also, Rosamund has her sights set on Benedict Bridgerton. Mao has appeared in projects like ‘Morgan’s Secret Admirer’ and ‘Surfside Girls’, and recently showed a different side of her range in Kogonada’s ‘A Big Bold Beautiful Journey’. 

Then there’s Posy Li, the younger sister, portrayed by Isabella Wei. Posy is often dismissed as silly by her own family. She talks too much. She misses social cues. She doesn’t fit the mold Araminta wants to sell. Yet Posy has a softer heart, and she occasionally offers Sophie small moments of kindness that feel rare inside that house. Wei is already familiar to Netflix viewers thanks to her role in ‘1899’ and has also appeared in ‘The Crow’. With Benedict stepping forward and Sophie caught between duty and desire, the ton is about to get uncomfortable. Very uncomfortable.