What Netflix romantic comedy series, a spin-off of the "To All the Boys I've Loved Before" film series, follows Lara Jean's younger sister, Kitty Song Covey, as she moves to Seoul for her own romantic adventures?

The Netflix romantic comedy series that serves as a spin-off of the "To All the Boys I've Loved Before" film series and follows Lara Jean's younger sister, Kitty Song Covey, as she moves to Seoul for her own romantic adventures is titled XO, Kitty (Review). The show premiered on Netflix on May 18, 2023. It marks the first Netflix television series to be a spin-off from a Netflix original film.

"XO, Kitty" centers on Kitty Song Covey, portrayed by Anna Cathcart, who reprises her role from the "To All the Boys (Review)" trilogy. In the series, Kitty, a self-proclaimed expert in love and matchmaking, moves halfway across the world to Seoul, South Korea, to attend the Korean Independent School of Seoul (KISS). Her decision is driven by a desire to reconnect with her long-distance boyfriend, Dae, who attends the school, and to learn more about her late mother's past, who also studied there.

The series delves into Kitty's journey of self-discovery as she navigates a new country, a new school, and the complexities of her own relationships. She quickly learns that love is far more complicated when it's her own heart on the line. Interestingly, "XO, Kitty" is the only Jenny Han show that is not directly based on one of her books, instead being an original story inspired by the characters she created. The show has been renewed for a second and third season, continuing Kitty's adventures at KISS.