SPOILER ALERT :  This post contains spoilers for Season 3 of “XO, Kitty,” now streaming on Netflix. Another season of “XO, Kitty,” another season of messy romantic decisions set against the backdrop of a posh private school in Seoul, South Korea. Created as a spin-off series to Jenny Han ‘s popular book and film franchise “To All The Boys I’ve Loved Before,” “XO, Kitty” focuses on “To All The Boys” lead Lara Jean’s precocious younger sister, the titular Kitty Song Covey (Anna Cathcart). Now