Seventeen-year-old Leah Zhang, a Chinese American former model living in Los Angeles, reluctantly attends her cousin Xiyue's wedding with her parents. Leah dreads the event because her Mandarin skills have deteriorated to the point where she can barely communicate with her Chinese-speaking relatives. Her anxiety deepens when she discovers that Cyrus Sui, her childhood nemesis, is seated at her table. Leah has not seen Cyrus since "the Incident" at their old school two years earlier, which she blames him for. He appears more somber than she remembers but, she admits grudgingly, even more beautiful.
When the bride approaches for a traditional toast, Leah attempts to recite a blessing phrase but mangles the words, telling the couple she hopes they have a depressing marriage and fall ill quickly. The deeply superstitious Xiyue bursts into tears and flees. Leah's aunt, Dr. Linda Shen, a renowned Stanford professor and Grammy-nominated composer, delivers a cutting remark through the closed doors, calling Leah's mother shameful for raising "such an ignorant foreigner." Cyrus translates the words for Leah, and they sting deeply.
In the aftermath, Leah's mother enrolls her in Journey to the East, a two-week immersive trip around China hosted by the local Chinese school Jiu Yin He in collaboration with Stanford's Department of East Asian Languages and Cultures, a program designed by Leah's aunt. The trip will help Leah improve her Chinese, strengthen her weak college applications, and prove to her family she is not the uncultured relative they now see her as. Leah, adrift after recently quitting modeling for reasons she keeps private, agrees partly out of guilt and partly because she has no other plans.
At the airport, Leah meets Oliver Kang, a wealthy, flirtatious boy, and is stunned to discover Cyrus is also on the trip. Cyrus has joined for a chance to impress Dr. Shen and secure a recommendation letter for Stanford's Chinese Literature program. Leah hatches a revenge plan: She will make Cyrus fall for her and then publicly reject him, repaying him for ruining her life. On the flight to Shanghai, they sit together, and guilt flickers across Cyrus's face when Leah mentions their old school.
In Shanghai, Wang Laoshi, the stern trip supervisor, assigns hotel roommates, pairing Leah with Daisy Yun, a shy, soft-spoken girl. A Chinese proficiency test reveals Leah's skills are the weakest in the group, and Wang Laoshi pairs her with Cyrus, the highest scorer, for a competition spanning three cities. The overall winners will present at an event where Dr. Shen will be present. Leah and Cyrus win the first contest, a haunted teahouse escape room, by combining his Chinese literacy with her sharp pattern recognition. During a market bargaining competition, Leah charms vendors while Cyrus translates. Afterward, noticing her painful blisters, he kneels to apply Band-Aids to her feet with surprising tenderness. Leah begins to question her assumptions but reaffirms her revenge plan.
On the bullet train to Anhui Province, Oliver asks everyone to name their passion. Leah, who has nothing to define herself by without modeling, desperately invents "cloud drawing" as a hobby. Cyrus, the only one who knows the truth, tests her by making her draw a cloud on his palm. He buys her favorite Choco Pies without being asked, and Oliver later lets slip that Cyrus talks about Leah constantly.
During a race up the Yellow Mountain, Cyrus shields Leah with his body when loose rocks cascade down the mountainside, sustaining a scrape on his wrist. Through an extended flashback, the full Incident is revealed: Leah told Cyrus she hated him during an argument on a staircase, and he slipped and fell. Witnesses concluded Leah had pushed him, security footage appeared to confirm it, and Cyrus, concussed and confused, told teachers she had hurt him. Leah was expelled. At the summit, an anonymous compliment activity produces notes that move her deeply, including one in thick ink: "Everything you touch turns beautiful. The world becomes beautiful, as long as there's you." Leah also visits the sacred fountain her cousin once prayed at and wishes in Mandarin for Xiyue's marriage to be blessed again.
In Guilin, Cyrus buys Leah a flower crown, mentioning his grandmother once sold them before his family immigrated to America. On a bamboo raft on the Li River, Leah experiences an unfamiliar, unconditional happiness not dependent on anyone's approval. During a photography contest in a bamboo forest, she wanders off and becomes lost as night falls. Cyrus tracks her down just as a snake slithers away from her feet, and she collapses into his arms.
That night, Cyrus wakes from a nightmare and confides that his parents divorced shortly after Leah left their school. His father told him love meant fighting, advice that shaped how young Cyrus treated Leah. Getting into Stanford is the one thing his parents ever agreed on, and he fantasizes his acceptance might reunite them. When he whispers, "I think I ruin everything I touch," Leah takes his hand and tells him, "You haven't ruined me."
In a quiet alley the next day, Cyrus confesses everything. He never meant to lie about Leah pushing him; concussed and reeling from her words, he said "She did" because she had hurt him emotionally, not physically. He wrote an apology letter after the expulsion that was lost in the mail. He tells her he has been in love with her for seven years, listing what he loved about her childhood self: her polka-dot socks, her laugh, the games she invented. He reveals that
qin ai de, the term he has been calling her throughout the trip, does not mean "my worst enemy" as he claimed; it means "my love." Leah's revenge plan collapses entirely. When he kisses her, she pulls him closer.
Leah finally tells Cyrus the real reason she quit modeling: A shoot for
Amalia magazine, meant to be her breakthrough, became a humiliating experience in which she was the only Chinese person present for a "traditional China" theme, with culturally inaccurate backdrops and costumes nothing like actual traditional garments. Cyrus holds her as she cries. When a boy in the group named Sean later discovers and circulates the
Amalia photos online, Leah accuses Cyrus of betraying her confidence and flees into the night. Daisy finds her and reveals Sean, not Cyrus, found the photos through online searching. When Leah admits she has never had a real friend, Daisy replies, "Okay, well, now you do."
Leah apologizes to Cyrus, and they reconcile as fireworks from a nearby wedding illuminate the sky. On the plane home, he confesses he bribed another passenger to swap seats on the original flight and attended the wedding hoping to see Leah, not just Dr. Shen. None of their proximity was accidental.
Back in LA, Leah and Cyrus win the overall competition. At the afternoon tea event, Leah delivers a speech in Mandarin, describing how "language, in its purest form, is really about understanding each other." Her aunt offers a faint, approving smile. In the weeks that follow, Leah fills her days with genuine friendships, pottery classes with Daisy, karaoke nights with the group, and a deepening relationship with Cyrus. Walking through LA at sunset, she tells him, "You love me," and it is no longer a question. He murmurs, "Of course I do," and they keep walking together.