The Summer I Turned Pretty has more story to tell in a surprise movie - but which alums are reprising their roles and which may not? Based on Jenny Han's book series, Prime Video's adaptation followed the love triangle between Belly (Lola Tung) and the Fisher brothers: Conrad (Chris Briney) and Jeremiah (Gavin Casalegno). The Summer I Turned Pretty, It's Not Summer Without You and We'll Always Have Summer inspired the show's three seasons, so imagine fans' surprise when Han confirmed there was more content coming.