Solange Pereira, a 28-year-old workforce development professional finishing a teaching fellowship in Washington, DC, is helping her cosmetologist cousin Natalia with makeup duties at a wedding at the Cartwright Hotel. While running an errand, Solange stumbles upon the bride, Ella, in a stairwell confessing her love to Tyler, a member of the wedding party whom she has loved since childhood. Tyler urges Ella not to go through with the marriage, but when Ella asks if he reciprocates, he says nothing. Solange tries to slip past unnoticed but is spotted, and Ella pressures her to stay quiet.
In the hallway, Solange collides with the groom, Dean Chapman, a handsome lawyer. They share a warm exchange, and Solange feels an immediate attraction. She already knows Dean is the best friend of her cousin Lina's boyfriend, Max, making the secret she carries all the more fraught. Her own father married her mother while in love with another woman, and the betrayal destroyed her family. This history compels Solange to act.
During the ceremony, when the officiant invites guests to voice their support, Solange blurts out, "I don't." Ella breaks down, admits she cannot marry Dean, and flees. Left alone with Dean, Solange recounts what she overheard. Dean is disappointed but not devastated, revealing that his relationship with Ella was a mutual arrangement built on compatible ambitions rather than love. He had organized his life around a rigid plan, and Ella was a checkpoint, not a soulmate. After confronting Ella privately and confirming the truth, he cancels the wedding.
The next day, Solange visits Rio de Wheaton, the Brazilian grocery store and café her mother, Izabel, runs with her two sisters in a Maryland strip mall. Izabel confesses she lied to their cousin Cláudia in Brazil, claiming Solange is in a serious relationship, and Cláudia's family now plans to visit and expects to meet the partner. Solange proposes that her roommate and closest friend, Brandon, an aspiring actor and bartender, pose as her boyfriend. She also discusses her uncertain career: her fellowship at Victory Academy, where she teaches adult education classes, is ending, and she is weighing a position at a nonprofit in Ohio.
A week later, Dean returns to his law firm, Olney & Henderson. A top associate named Kimberly Bailey is considering joining the firm, and her father is the general counsel of Baxter Media Group, a major potential client. Senior partner Sam Henderson, who resents Dean, favors giving the recruitment assignment to Peter Barnum, Dean's rival, because Peter has a wife and Dean is newly single. In a panicked improvisation, Dean claims to be in a serious relationship with Solange.
Solange agrees to the ruse under conditions: She will be herself, physical contact requires a safe phrase, and Dean must respect her schedule. In return, Dean promises her an open-ended favor. They visit each other's homes and begin building genuine familiarity. At Solange's apartment, Dean meets Brandon and notices a photo collage of hotel service workers, a practice inspired by Solange's mother, who cleaned houses when she first immigrated from Brazil.
Over a series of fake dates, including dinner at an upscale restaurant, axe throwing, and karaoke at a bar called Sip City, their chemistry becomes undeniable. They deflect Peter's attempts to undermine Dean and impress Kimberly and her partner, Nia. Dean reveals that his mother's habit of uprooting their lives for unreliable boyfriends convinced him romantic love is a weakness. Solange shares her own history of disappointing relationships and her refusal to settle for partners who cannot commit fully. After a karaoke performance in which Dean strips off his shirt onstage, they share a genuine kiss at the bar. Both are shaken, and Solange reframes it as an act.
Events draw them closer still. Peter lures them to what turns out to be a sex party; Dean panics, but Solange calmly navigates the situation. When Natalia goes into labor, Dean insists on helping: he wears electrodes from a contraction simulator so she can practice her birthing technique despite her husband's absence. At the hospital, Dean is moved by the warmth of Solange's extended family, something he never experienced growing up. In a stairwell afterward, they kiss passionately before a noise interrupts them.
Meanwhile, Victory Academy's director offers Solange a permanent position, but she keeps this from Dean. When the Brazilian cousins arrive early, Solange calls in Dean's promised favor, asking him to continue the boyfriend act for her family. They share his condo and his bed, and after acknowledging their attraction, they have sex for the first time. Both insist the arrangement is purely physical. At a family dinner, Cousin Cláudia makes pointed remarks about single motherhood, and Dean delivers an impassioned defense of Solange's family, praising her tias (aunts) for their strength and devotion. Solange's feelings for him deepen.
The arrangement unravels when Dean's mother, Melissa, arrives unexpectedly after a breakup. Dean tells Solange their time together was a fantasy and that he needs stability she cannot provide. He confronts her about concealing the Victory Academy offer. Solange explains she did not want him to influence a decision that should be hers alone, given their core incompatibility: her need for a fully committed partner versus his refusal to fall in love. They part at the elevator.
Shortly after, Melissa inadvertently reveals the fake relationship to Peter during a visit to Rio de Wheaton. Peter reports the deception, and Dean is fired. He goes straight to Solange, who takes responsibility, but Dean insists the consequences are his. The firing clarifies Solange's decision: She accepts the permanent position at Victory Academy. Dean spirals, missing Solange. Max intervenes, pointing out that Dean's first instinct after losing his job was to go to her and that a job is not a personality.
On his last day clearing his office, Dean encounters Kimberly, who reveals that she and Nia are best friends, not romantic partners. Kimberly faked their relationship because she is secretly in love with Nia. The parallel to his own situation strikes Dean. He urges Kimberly to confess her feelings and resolves to do the same with Solange. Kimberly introduces Dean to her father, Larry Bailey, who invites him to submit his résumé to Baxter Media Group.
In Las Vegas for Brandon's 30th birthday, Solange admits aloud that she is in love with Dean. Brandon posts a photo of the Marriage License Bureau on Instagram with a caption implying he and Solange are getting married, then hides her phone. Back in DC, Max alerts Dean, who books the first flight to Vegas. Solange's mother and aunts, in on the plan, board the same flight.
Dean races to the Oasis Wedding Chapel only to find Solange and Brandon posing for photos after watching a stranger's ceremony. There was never a wedding. Standing in the chapel, Dean confesses that he believed love was a weakness until Solange changed everything. Solange tells him she chooses him, acknowledging she spent years avoiding commitment out of fear. Dean asks her to be his girlfriend, and she agrees.
In an epilogue set one year later, Solange and Dean live together. She thrives at Victory Academy, mentoring her former student Layla, who has earned her GED. Dean works at Baxter Media Group's legal department, where he has launched a pro bono program and is assigned the satisfying task of informing Henderson and Peter that Baxter will not hire their firm. Max is about to propose to Lina; Brandon has moved to New York to pursue acting. Dean and Solange attend Kimberly and Nia's wedding at the Cartwright Hotel, the same venue where Solange crashed Dean's wedding. Dean reflects that Solange is the love of his life and that, as Max once told him, sometimes the detour becomes the destination.