Cast Revealed for Viral BookTok Adaptation 'Love Hypothesis'

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BookTok sensation The Love Hypothesis lives up to the hype with Lili Reinhart and Tom Bateman leading Ali Hazelwood’s on-screen romance.

The much-anticipated adaptation of Ali Hazelwood’s BookTok phenomenon The Love Hypothesis is officially underway, and the cast has finally been revealed. Here’s everything fans need to know:

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Lili Reinhart as Olive Smith

Riverdale alum Lili Reinhart will headline the film as Olive Smith, the determined PhD candidate caught in a fake‑dating experiment. Reinhart is also serving as an executive producer, bringing personal passion and creative control to the project, one she unveiled via TikTok and Instagram, along with her first on‑set photos featuring a dramatic brunette look.

Tom Bateman as Dr. Adam Carlsen

Tom Bateman, known for Murder on the Orient Express and Death on the Nile, has been cast as the enigmatic Professor Adam Carlsen. His real‑life connection—he’s married to Daisy Ridley, inspiration behind the novel’s Star Wars–derived origins—gives his casting extra meta resonance.

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Strong Production Team

The adaptation is being directed by Claire Scanlon (Set It Up, Abbott Elementary) from a script by Sarah Rothschild. Produced by Elizabeth Cantillon with executive producers including Reinhart and Hazelwood herself, the project taps formidable talent from rom‑com and TV alike.

 In Production Now—No Release Date Yet

Filming began mid‑July in Montreal, as confirmed by on‑set TikToks and union listings, with production expected to wrap by late summer. As of now, the release plan remains undisclosed.

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From Fan-Fic Roots to Big Screen

Originally published on Archive of Our Own as a Reylo fan‑fiction, Hazelwood’s bestselling novel was acquired in 2022 by Bisous Pictures. Hazelwood says she “can’t believe this is happening” and fully trusts the stellar creative team.

With Lili Reinhart’s charismatic lead, Tom Bateman’s smart casting, and a talented creative squad, The Love Hypothesis adaptation is shaping up to be a charming, witty rom‑com transition from the page to the screen. Stay tuned—this is one romance story that may just win hearts all over again.