Rajiv Malhotra, portrayed by Sachin Khedekar, is on his way home to join his pregnant wife, Ankita. During the flight, he unwittingly befriends Charles, who is involved in smuggling. In a turn of events, Charles exploits Rajiv, using him to transport diamonds into Mumbai just as Rajiv rushes to the hospital to be with Ankita. After the birth of their twin boys, Charles visits to congratulate the couple, but Rajiv discovers his true nature and alerts the police. In the chaos, Charles flees with one of the twins, claiming the child died in an explosion.
To ensure their safety, Rajiv and Ankita relocate to London with their son, Prem, played by Varun Dhawan](/actor/varun-dhawan), while the other twin grows up in the slums of Mumbai, known as Raja. The boys, born conjoined at the arms, share a unique connection, where one’s strength compensates for the other's weaknesses. As they mature, Prem struggles with bullying in college, finding solace in his friendship with Samaira, played by Taapsee Pannu. Meanwhile, Raja’s aggressive nature leads him to fight Alex, the son of a local mobster, prompting Raja to seek a way out of the country, aided by Pappu Passport, portrayed by Johnny Lever.
During his escape, Raja meets Alishka Bakshi, played by Jacqueline Fernandez](/actor/jacqueline-fernandez), on a flight and falls for her instantly. Back in London, Officer Dhillon, played by [avan Malhotra, pursues Raja, viewing him as an illegal immigrant. At the same time, Prem is caught in a web of confusion as Samaira’s mother tries to orchestrate a romance between Samaira and Prem against their wishes.
As the story unfolds, Rajiv envisions marrying off Prem to Alishka, but the confused dynamics lead to misunderstandings. Prem attempts to impress Alishka, but she seems smitten by his twin brother, Raja. In a twist, Samaira mistakes Raja for Prem when he rescues her from bullies, further complicating their love lives.
Amidst this turmoil, Rajiv is contacted by Charles, who is set to be released from prison and threatens to destroy Rajiv's family. Following a close brush with fate, Raja saves Rajiv from an accident, but they uncover more chaos when they discover that Alex, who had a previous run-in with Raja, is actually Charles' son and has lost his memory.
Meanwhile, the twins touch the store’s owner during a jewelry purchase, leading to another case of mistaken identity when the ring Prem selects for Samaira accidentally ends up in Alishka's hands. The rift deepens as Samaira overhears Prem rejecting Alishka, leading to a breakup.
As the twins finally connect the dots of their identity, they devise a plan: Raja will woo Alishka on Prem's behalf, while Prem will charm Samaira as Raja. In a climactic encounter with Alex, who regains his memory and seeks revenge, the complexities unfurl with Raja and Prem eventually uniting to save their father and get their happy endings with their beloveds.
