Mrinalini 'Milli' Chakravarty (Sonam Kapoor) is a passionate physiotherapist dedicated to her work in the IPL. Her mother, Manju (Kirron Kher), wishes for her to find a suitable partner, ideally someone from a noble background. In an unexpected twist of fate, Milli is called upon by a royal family to treat their King, who is struggling with mobility issues. Upon arriving at the Sambhalgarh palace, she encounters the strict Queen, Nirmala Devi Rathore (Ratna Pathak), who is not impressed by Milli's exuberance and perhaps a bit clumsy demeanor.
As Milli navigates the rigid protocols of royal life, she soon meets Yuvraj Vikram Singh Rathore (Fawad Afzal Khan), whose distant manner mirrors the formality of his parents. Moreover, Milli learns about Divya, the family’s youngest member who dreams of being an actress and is considering running away from home. Milli forms a bond with Divya, trying to persuade her to reconsider.
Despite her best efforts, Milli faces a significant challenge when the King keeps avoiding his rehabilitation exercises, putting her resolve to treat him at risk. In her quest for help, she turns to Vikram, who similarly advises her that if she cannot handle the situation, perhaps she should leave. Frustrated, Milli passionately accuses the Royal Family of being stubborn, rigid, and self-centered. Vikram reflects on her words, yet the King remains resistant.
Complicating matters, Vikram is engaged to the elegant Kiara (Aditi Rao Hydari). Just as Milli contemplates her departure, she learns from the royal servant, Ram Sevak, about a tragic accident from ten years past: the family's eldest son, Ambar, died in a car crash, which not only left the King with a disability but also forever altered the dynamics within the palace. The joyful atmosphere that once prevailed has evidently dimmed into one of sorrow. With determination, Milli encourages the King to confront his guilt, ultimately fostering a friendship that helps him resume his exercises.
A twist of fate has Milli kidnapped during a village tour, leading to a dramatic rescue by Vikram, followed by a spontaneous kiss as they celebrate her safety. Despite the budding romance, Milli's feelings for Vikram are complicated by his engagement and his sense of duty towards royal expectations. Adding fuel to the fire, Vikram is negotiating to acquire land from a rival royal family for a proposed heritage hotel, facing steadfast refusal from the Maharaja.
During a visit to the property, Milli engages with the Maharaja, prompting her to propose a mutually beneficial arrangement that ultimately swings the negotiations in Vikram's favor. However, with her mother, Manju, and Vikram's father unexpectedly arriving and expressing concerns about their relationship, the situation becomes explosive, particularly when Manju reveals Milli's feelings for Vikram to the Queen.
The plot thickens as Divya attempts to pursue her acting dreams in Jaipur, leading to tensions that culminate in Milli being blamed for her actions when the Queen learns of the runaway. Amidst a storm of emotions, the King finally acknowledges the importance of happiness and life, leading him to stand for the first time since his accident, attributing his progress to Milli’s influence.
As Vikram grapples with his feelings, he ultimately breaks off his engagement with Kiara, declaring his love for Milli. With the royal family’s support, he embarks on a journey to find her. Their reunion culminates in a heartfelt proposal where he wins over Manju’s approval. Now, as Vikram Singh Rathore’s wife, Milli embraces her new life as the Royal Misfit, beautifully intertwining love and personal growth against all odds.
