Happy Ending movie revolves around romance and comedy, with a take on love, relationships, marriage, friendships, plagiarism and happy endings.
Story in detail:
The movie starts off with Kareena Kapoor's character (cameo) confessing her love by telling those three magic words to Yudi, a one-book wonder author and someone who is (self-confessedly) not allergic to 'I Love You', but the baggage attached with it'. And when Yudi doesn't reciprocate her feelings, Kareena's character shows him the middle finger (quite literally!).
No sooner does she exit Yudi's life, enters Vishaka (Kalki Koechlin), a dentist by profession, and is head over heels in love with Yudi. She loves Yudi so much that she even installs a mobile app called 'Nospace' on his cell so that she can keep track of his whereabouts. While she leaves no stone unturned in gaining his attention, Yudi is totally unmoved by her and her feelings and emotions towards him and wants to constantly break up with her.
Whenever Yudi is in trouble or feeling lonely, the only two people whom he always looks upto are his 'ex-girlfriend-now-a-mother-of-three childen' Divya (Preity Zinta), and his best friend of many years Montu (Ranveer Shorey), both of whom lend him a patient listening and help him sort out the mess of his life.
Because he blows up all the money that he had made from his book, he returns back to writing but, he gets dejected when he sees that the same publishers hiring the gorgeous Aanchal Reddy (Ileana D'cruz), whose romantic novels sell like hotcakes.
What peps him up is the offer to write a script for 'Armaanji' (Govinda), an actor who wants to capture multiplexes after having conquered the single screens. To get a hold of 'success formula' in writing, Yudi decides to befriend Aanchal. Taking resort to a few tricks here and there, Yudi not only manages to befriend her, but also lands up spending 'quality time' with her.
Right at the start of this 'relationship', the duo agree to be together without falling in love with each other. While Aanchal is clear about this relationship, it is Yudi who goes onto realize that he has actually fallen in love with her!
Will Yudi gather the guts to confess his feelings to the very practical Aanchal, what happens to the status of his relationship with Vishaka, and does Divya and Montu's advice really make a difference in Yudi's messed up life and lastly, does Yudi manage to stage a writing comeback with Armaanji's film is what forms the rest of the film.