The 'Bridgerton' season 4 cast and who they play

Luke Thompson and Yerin Ha in "Bridgerton" and on a red carpet.

Liam Daniel/Netflix; Lucy North/PA Images/Getty Images

• The entire fourth season of "Bridgerton" is now officially on Netflix.
• Season four adapts Benedict and Sophie's story from the book "An Offer from a Gentleman."
• Here's where you might recognize the main cast members from outside the world of the Ton.

Dearest gentle readers: "Bridgerton" is back. And with a new season of Netflix's romance series...