Six-year-old Akash lives with his parents and grandfather (Rishi Kapoor), who is a photographer. Akash's grandfather predicts that Akash (Pulkit Samrat) will fall in love with a girl who lives 500 steps away from their studio and that they will be in love forever but won't be able to be together. Akash takes the 500 steps and finds a tall girl older than him, disappointing him. Meanwhile, when he gets to high-school, he falls for Shruti (Yami Gautam). But he left her without informing just because he had to continue his studies and when Shruti learns this, she was shattered. She couldn't accept his selfishness after a long-term, affectionate relationship.

In the present, Akash works for a private firm and leads a monotonous life. When he learnt that his grandfather's health has worsened, he decides to leave the city. He tries to find Shruti but fails. When he finds that his boss (Manoj Joshi) dismissed him, he rushes back and is asked to secure a big contract for his company if he wants to save his job. He travels to Canada to meet Mrs Pablo, their company investor's wife who is now broken-up with her husband. He attends a yoga camp, where he becomes friends with Mrs Pablo and learns that her real name is Akansha (Urvashi Rautela). Akash also meets Shruti there, who behaves like a happy-go-lucky girl that doesn't recognise Akash. Akash pretends to be in love with Akansha to secure the contract, but he and Shruti fall in love with each other again during completing a task in the camp.They slept together and revived their lost love. It is also revealed that Akansha is none other than the tall girl that Akash met in his childhood. Akash is again left heartbroken when Shruti leaves at the end of the camp, saying that they can't be together.

Akash realizes Shruti still loves him and embarks on a journey to find the truth behind her rejection with the help of Akansha. He learnt that she left him because she is suffering from a rare heart disease; she will die if her heart isn't transplanted soon. She requested to live with him all the life they would if they were given a chance to. In a few days, she felt the life of being newly married till the old age.And when the theme song (sanam re) ends they have a really sweet conversation. By the time, Akash had to leave for his job purpose.

A few months later, unexpectedly Shruti moves out of the hospital, healthy and cured. In order to be with Akash, she moves to the city to find him and is left shocked when his phone is switched off and she can't contact him. Despite her love, she went searching for him and in the end when she comes to where Akash lived during the childhood, her heart beats fast. That's when she learnt, he gave his heart to her.