Devrath "Dev" Dixit lost his father at a young age and hence his widowed mother, Ishwari brought him and his three sisters up, Neha, Riya and Nikki singlehandedly. Due to unfavorable financial circumstances, Ishwari could only educate Dev and Neha was left at home to take care of Riya and Nikki. Now, Dev, a successful business tycoon, owes everything to his mother and has a feeling of indebtedness and complete devotion for her, and her entire life revolves around him. He has become a workaholic and short tempered as a result of his childhood hardships, but is kind hearted and will go to any extent to help others. Neha, though loves her family, still has resentment in her heart and feels that her mother has done partiality among her children, only educating Dev and depriving her of any opportunities. Dev finds that Ishwari has history of fatigue due to improper nutrition. Dr. Sonakshi "Sona" Bose, Kolkata based, quick-witted, lively young nutritionist, lives with her family in Delhi.
Dev hires Sona to take care of Ishwari's health. Sona and Ishwari develop a friendly bond, and her health improves. Dev and Sonakshi get off on the wrong foot, but they eventually understand each other better. They start dating and fall deeply in love with each other. Dev gradually becomes more cheerful and carefree. When Ishwari learns of their relationship she is heartbroken as she fears that she will be replaced by Sona in Dev's life. When Dev realizes that his mother does not approve of this relationship, he takes a practical decision and decides to part ways, leaving Sona heartbroken. But Dev is unable to forget Sona and descends into a downward spiral. Sona agrees to marry the guy her father chose for her but their engagement is broken off when Sona leaves her fiancé in the middle of her engagement to tend to Dev's wounds. Ishwari realizes that Dev cannot be happy without Sona, and agrees to their marriage. Sona and Dev reconcile and get married.
Dev and Sona settle into their married life, and days pass by. Although Ishwari maintains that she is happy for them, she is still slightly uncomfortable with Sona's presence in Dev's life, and hasn't completely accepted her yet. Dev struggles to balance between his duties as husband and son. Vicky and Radharani create misunderstandings between Sona and Ishwari following which Sona leaves the house. Dev unable to face this leaves the house and goes to the farmhouse where Vicky gets him drunk and cheats him into signing papers, increasing the misunderstandings. Sona begins to lose faith in Dev. She finally meets Dev at the farmhouse where they have an explosive argument. After a bitter exchange of words, Dev and Sona part ways.
7 years later
Sona is now a successful businesswoman magnate living in Kolkata with her family and six-year-old daughter Suhana, while Dev becomes a casanova, not knowing that he and Sona have a daughter. She shifts to Delhi for business purposes and unknowingly buys a portion of Dev's office. Eventually, while befriending Suhana as she and his nephew Golu study in the same school, Dev sees her with Sona and finds the truth about her. Dev is overjoyed to know he has a daughter and becomes a loving father to her. Sona and Dev decide to stay in each others' house for one week each for the sake of Suhana's happiness. Sonakshi's brother Saurav marries Ronita. Dev and Sona have a heart to heart talk wherein they admit that they were equally responsible for the failure of their marriage. They forgive each other and are finally able to let go of the bitterness, they held for each other, and become friends. Meanwhile, Ishwari starts liking Sona after saving her from Khatri(a man who had been blackmailing Ishwari by framing her for a crime she did not commit). Ishwari finally lets go of her biased view and starts seeing Sona in a new light. Reflecting on the past, she realizes her mistakes and apologizes to Sona, and finally accepts her as her own daughter. During all this, Dev and Sona realize that they still love each other, and reunite. They learn from their past mistakes and build a stable relationship. Sonakshi helps Dev correcting his mistakes he had done in those seven years and hence brings all the members of the Dixit family back together. She and Dev then find out that Vicky was the main cause for all their misunderstandings, and Dev throws him out of the house. Sonakshi gets pregnant again, and Dev is overjoyed that he gets to relive the journey he missed with Suhana. Vicky, now a changed man, comes back and apologises, and is welcomed back into the family. Sonakshi gives birth to a baby boy named Shubh.
