Jeremiah Isn’t Done Fighting: The Summer I Turned Pretty Season 4 Sets Up the Most Explosive Love Triangle Twist the Show’s Ever Seen

Just twelve days after the emotional gut-punch of The Summer I Turned Pretty Season 3 finale aired on September 17, 2025, showrunner Jenny Han dropped a bombshell that has reignited the flames of Cousins Beach drama. In an exclusive interview with Entertainment Weekly, Han confirmed that the series—previously billed as a three-season adaptation of her trilogy—will indeed return for a fourth installment, this time in the form of a feature-length movie slated for a tentative 2027 release on Prime Video. “Belly’s story isn’t over,” Han teased, her words dripping with the kind of suspense that only a master of YA heartache could muster. “We’ve seen her choose, but choices have consequences. And Jeremiah? He’s not walking away without a fight.” This revelation isn’t just an extension; it’s a seismic shift, priming the pump for what could be the most volatile iteration of the Belly-Conrad-Jeremiah love triangle yet—one where the sunny underdog brother refuses to fade into the sunset, threatening to shatter the fragile happiness Belly has clawed her way toward.

For the uninitiated (or those still recovering from post-finale tissue shortages), Season 3 wrapped the trilogy’s core arc with a flash of hope amid the heartbreak. After a whirlwind of wedding planning gone awry—complete with Susannah’s posthumous letter to Conrad sparking a brotherly brawl, and Belly’s raw admission that a piece of her heart would always belong to her first love—the big day crumbled. Belly (Lola Tung) called off her engagement to Jeremiah (Gavin Casalegno) in a moonlit confrontation that left fans divided between cathartic relief and aching sympathy. She bolted to Paris for a semester abroad, a bold step toward self-discovery that felt like a triumphant middle finger to the boys who defined her summers. Then came the finale’s swoon-worthy pivot: Conrad (Christopher Briney), ever the brooding med student, “accidentally” crosses paths with her en route to a conference. What starts as awkward small talk erupts into a day of stolen kisses under the Eiffel Tower, fervent confessions in her tiny apartment, and a montage of Christmases in the City of Light. It’s endgame for Team Conrad, with Belly’s voiceover echoing the books: “In every universe, I choose you.” Jeremiah, meanwhile, licks his wounds back in Cousins, reconciling with his estranged father Adam and tentatively sparking something with Steven’s sharp-witted coworker, Denise (Isabella Briggs). A soft kiss on the beach signals his fresh start—or so we thought.

But Han’s announcement flips the script, hinting that the movie will plunge us two years post-finale, where Belly and Conrad’s Parisian idyll has evolved into something more permanent: a quiet engagement, whispered plans for a low-key wedding back at the beach house. Fans on X erupted with speculation, one viral thread positing, “Jeremiah’s new relationship with Denise? That’s just setup for him to crash the wedding and expose Conrad’s jealousy issues. Han wouldn’t let Jere go out like that.” The post, which garnered over 10,000 likes, captures the electric buzz: Jeremiah, portrayed as the eternal optimist who’s weathered betrayal and loss, isn’t content with a consolation prize. Sources close to production (whispered through Variety’s grapevine) suggest the film will explore his “unresolved rage,” a simmering resentment toward Conrad that boils over when he discovers Belly’s impending nuptials. “He’s not fighting for Belly out of spite,” Han clarified in her EW sit-down. “It’s about reclaiming his agency after being the perpetual second choice. But in doing so, he risks destroying the family they’ve all fought to hold together.”

This twist elevates the love triangle from a teenage tug-of-war to a full-blown adult reckoning, outstripping the show’s previous peaks of drama. Remember Season 2’s gut-wrenching volleyball game betrayal, where Jeremiah’s rebound kiss with Belly felt like a desperate grasp at normalcy amid Susannah’s cancer battle? Or Season 3’s explosive Episode 9, where a misdirected letter from their late mother ignites a physical altercation between the brothers, with Jeremiah snarling at Belly, “A part of you will always love him—admit it!”? Those moments crackled with immediacy, but they were rooted in youthful impulsivity. The Season 4 movie, however, promises maturity laced with menace: Jeremiah, now a rising chef in Boston with a seemingly stable life alongside Denise, stumbles upon Belly and Conrad’s engagement announcement during a family holiday reunion. What follows is a masterclass in slow-burn sabotage—subtle at first, like Jeremiah volunteering to cater the engagement party, his easy charm masking barbs aimed at Conrad’s therapy progress and lingering anxieties. “You’ve got her now, bro,” he quips in one leaked script snippet circulating on Reddit. “But we both know how long that lasts.”

The explosive core? A revelation that Jeremiah has been harboring a secret from his post-breakup glow-up: during those months of “healing,” he uncovered evidence of Conrad’s own infidelity scare—a drunken near-miss at a med school party, confessed in therapy but never to Belly. Armed with this ammunition, Jeremiah confronts his brother in a rain-soaked beach showdown that echoes the trilogy’s stormy motifs, forcing Belly to question if her “infinite” love with Conrad is built on the same shaky foundations that doomed her with Jere. “It’s not just about winning her back,” Casalegno told Vanity Fair in a post-finale profile. “Jeremiah’s arc is about fighting for closure, even if it means burning it all down. He’s done being the nice guy who loses.” Fans are already dissecting this potential powder keg on X, with one thread titled “Jere’s Revenge Era Incoming” racking up 5,000 replies: “Finally, the twist where the underdog goes nuclear. Team Jeremiah rise!” Another counters, “This ruins the books—Belly chose growth, not endless drama.”

Yet, this setup isn’t mere fan service; it’s a deliberate evolution of Han’s themes. The original novels end on an epilogue of Belly and Conrad’s wedding, a serene fade to black that glosses over the scars. The series amplified the messiness—Belly’s Paris arc introduced cultural clashes and independence, while Jeremiah’s cheating subplot (adapted but softened from the books, where it was a spring break fling during a break) humanized his flaws without excusing them. Now, the movie dares to ask: What if the choice that healed Belly also reignited the Fisher brothers’ fratricidal rivalry? Denise’s role adds layers; as Briggs revealed in a recent podcast, her character “won’t be collateral damage—she’s the voice of reason calling out Jeremiah’s toxicity, but she’s in love, so she’ll fight for him too.” This could spawn a secondary triangle, with Steven (Sean Kaufman) caught in the crossfire as Denise’s business partner, echoing the familial fractures that defined earlier seasons.

Social media is a battlefield of prophecies. X users like @giselleb1234, whose viral clip of Jeremiah’s “she didn’t choose me, but she didn’t pick you either” line from Episode 8 has 1,100 likes, argue it’s foreshadowing: “Jere’s pride is wounded—he’ll sabotage ConBelly just to prove he’s not second best.” Team Conrad loyalists fire back, citing @akakaylen’s post: “Jeremiah treats everything like a competition… no growth. Let Belly heal.” The discourse peaks in threads analyzing Han’s handwritten finale note—”Maybe we’ll meet again one summer in Cousins”—as a deliberate hook, with over 20,000 engagements debating if Jeremiah’s “new circumstances” (as teased in Prime Video’s synopsis) include a vengeful return.

Critics are cautiously optimistic. Vulture’s recap of the finale praised the series for “raising the stakes without cheapening the grief,” but warned that extending beyond the books risks “diluting the nostalgia.” BBC’s coverage hailed Season 3’s record-breaking 25 million global viewers, noting the finale’s “emotional closure” for Jeremiah’s arc—reconciliation with Adam, a tender kiss with Denise—only for Han’s movie reveal to “reopen old wounds in the most delicious way.” If executed with the show’s signature blend of Taylor Swift needle drops and ocean-side catharsis, this twist could cement The Summer I Turned Pretty as a YA landmark, proving love triangles don’t dissolve with a choice; they mutate.

As production rumors swirl—filming eyed for Wilmington’s beaches in spring 2026—the anticipation is palpable. Will Jeremiah’s fight expose cracks in Conrad’s armor, forcing Belly to confront if her “every version of me” vow holds water? Or will it catalyze true brotherhood, with Jere emerging wiser, perhaps even walking Belly down the aisle as a platonic ally? One thing’s certain: in Han’s world, summer’s end is never truly the end. The tide’s turning, and Jeremiah’s ready to ride the wave—explosive, unyielding, and utterly unforgettable.