When Jenny Han was writing the first novel in the early 2000s, there was one thing that always got her into a creative zone: a Taylor Swift album. (And, honestly, what better way to feel inspired by teen romance than to listen to Swift?) "I was listening to 'Fearless' and I was like, 'These songs have really helped me get to the finish line,'" Han told E! News. "When I write books, I like to listen to music to help me see the emotional vein of the story and her music really did that with me for the series." 

When it came time to write a sequel for the series, Han nearly made the decision to dedicate the entire book to the pop star.

Fast forward a decade to Han's deal with Amazon Studios, and the writer found herself searching for the perfect tracks to play throughout the Season 1 finale. Swift made perfect sense for the incredible moment when Belly and Conrad stare into each other's eyes and dance the night away at the debutante ball (something that never happened in the novel). "It's fun that we got to do Taylor's Version and she's reimagining her music also, the way I'm reimagining 'The Summer I Turned Pretty,'" Han said. "It's just looking at something that you made years ago and reapproaching it and what does that look like today?"

After all, as Swift would iconically say, "Everything Has Changed."