Jagu (Anushka Sharma) accidentally met a man named Safraz (Sushant Singh Rajput), and the two people with similar interests quickly came together. However, Safraz is a Pakistani, and his nationality and beliefs have made this relationship strongly opposed by Jagu's family. Not only that, the leader of Jagu's father's faith, Tapasvi (Saurabh Shukla), predicted that Safraz was destined to deceive and abandon Jagu. In order to prove the absurdity of the prophecy, Jagu decided to have a flash marriage with Safraz. However, on the wedding day, Jagu waited for a breakup letter. Heartbroken Jagu returned to his hometown and became a reporter. By chance, Jagu met a man named PK (Aamir Khan). What surprised Jagu was that PK actually claimed that he was an alien, because the key of the spacecraft was taken away, so he wandered to the earth. At first, Jia Gu thought PK was talking nonsense, but what happened afterwards made Jia Gu begin to believe what PK said, and Jia Gu even decided to help PK find a way to return to his planet.