'Bridgerton' is set to become a struggle between a romantic "fairytale" and the "actual reality of the world"

Luke - who plays Benedict Bridgerton on the show - told Tudum: "What's striking about season four is that it's the struggle between a proper old-school fairytale - the romance of it - and the actual reality of the world. And both are true.

"You have to hold both of them - the romance and the reality - in your hand.

"In its best version, 'true love' happens in the middle of that."

Yerin Ha plays Luke's on-screen love interest, and the actor hopes that their dynamic will prove to be "relatable" for viewers.

He shared: "The scripts that Jess [Brownell, the showrunner] and her team have come up with are dynamite. They're really, really, really exciting.

"The storyline is a bit of a twist on 'Cinderella'. You remember being told those stories as a child - the magic and the romance of them. It's really exciting to have that weaved into the world that we know of 'Bridgerton' ... It's such a great story, but it's also, I hope, really relatable."

Meanwhile, Yerin has admitted that she relished appearing on the hit TV show.

The 29-year-old actress - who plays the part of Sophie Baek - explained: "What drew me to Sophie was that she immediately has obstacles - something that she constantly has to overcome. Whether it's this battle around social status or trying to hide her feelings from Benedict."