In the climax of the movie, Tanu Trivedi (Kangana Ranaut) and Manoj “Manu” Sharma (R. Madhavan) face challenges in their marriage. Tanu is married to Raja Awasthi (Jimmy Sheirgill), and Manu is romantically involved with a look-alike of Tanu, Kusum Sangwan (also played by Kangana Ranaut).
In the resolution, Manu is mistakenly taken to be dead, leading to a series of misunderstandings. Tanu realizes her love for Manu and rushes to stop him from marrying Kusum. In a twist, Manu, who is very much alive, arrives at the wedding venue to find Tanu.
The film ends with Manu and Tanu reuniting, and Kusum graciously stepping aside. Tanu and Manu decide to give their marriage another chance, and the movie concludes with a happy reunion for the couple.
In summary, “Tanu Weds Manu Returns” ends with the central characters overcoming misunderstandings and rekindling their love, resulting in a happy reunion and the possibility of a renewed relationship. The film explores themes of love, marriage, and the complexities of romantic relationships.