Olive accidentally records a private conversation in which Tom Benton harasses her, insults her work, and falsely claims her success depends on being Adam’s girlfriend. She hides the recording, then later plays it for Adam at a formal dinner with Harvard faculty. Adam defends Olive fiercely—confronting Tom publicly—…
In the fallout, Olive and Adam finally admit their true feelings for each other. Adam reveals he's been in love with her for years, ever since their chance meeting in a bathroom when she first interviewed. Olive, having realized the same, confesses she loves him too.
In the epilogue, ten months later, Olive and Adam recreate their first kiss—exactly one year after the fake-kiss Olive initiated to win a bet—which serves as a symbolic affirmation that their relationship, once fake, has become genuine, committed, and based on mutual professional respect and personal love.
If you meant the movie adaptation rather than the novel, the final scenes are likely similar, but adaptations sometimes change or shorten some events. The details above are specific to the novel by Ali Hazelwood.
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