is a hit on the page and onscreen! As fans gear up for season 2 of the Prime Video series, ET is taking a look at the biggest changes between Jenny Han's books and the Lola Tung-led drama.The story follows Belly (Tung), a teen on her annual summer trip to the fictional Cousins Beach with her mom, Laurel (Jackie Chung), and older brother, Steven (Sean Kaufman). While there, they stay with Laurel's lifelong friend, Susannah (Rachel Blanchard), and her teenage sons, Conrad (Christopher Briney) and Jeremiah (Gavin Casalegno), who Belly is romantically torn between.When it came to adapting the series for the screen, Han, who serves as co-showrunner, knew it wouldn't be an easy task.«It's a bit of a balancing act, because I really had to weigh what the fans are expecting with where the show is going creatively and find that balance,» she told .