In a last-ditch attempt to revive their relationship, writer Su Dong invites his ex-girlfriend Zhao Ying on one final trip, planning to woo her at the site of a mythical tree that blooms only once every 100 years. Zhao begrudgingly succumbs to Su’s pestering but, unbeknownst to Su, also invites her new fiancé, the older and seemingly dim-witted Gu.
Growing increasingly jealous, Su makes Gu his unwilling rival. Between long, arduous hikes and over-the-top romantic gestures, Zhao Ying remains unimpressed, but an uncanny friendship forms between the two men. That is until the trip takes a more sinister turn, eerily mimicking the the plot of Su’s latest novel, A Romantic Fragment.