This results in him being rather closed off and seemingly rude to most people and happenings around him, alongside a strong dislike for trying things out of his comfort zone.

Arjun-Janani's marriage preparations go really well until Janani decides to reconcile with her ex-boyfriend, resulting in their wedding being called off and causing Arjun depression.

To help him overcome this hurdle, Arjun’s doctor advises him to read the short stories she had written about two couples—Veera-Meenakshi and Mathi-Prabha.

During a rainy day, a pregnant Meenakshi is left alone in her home, while Veera goes out and unexpectedly encounters a tragic accident.

En route, she meets Prabhakaran alias Prabha with whom she travels in a car but later comes to know that he consumed poison because of love failure.

Later asks Mathi's hand of marriage to her father, Senniappan, with whom he plots a plan to make her agree along with his consent.

Arjun, who changes completely because of both the stories transforms into a different person, starting to admire small things and staying happy always.

Described as "romantic entertainer-cum-road movie", Karthik stated that the film would have four lead actresses and that discussions for roles were held with Nivetha Pethuraj and Megha Akash.

[4] Other actresses including Akshara Haasan, Nazriya Nazim and Parvathy were also considered for the film, though none of them were officially signed on for the project.

[5][6] In June 2017, Karthik stated that the casting process for the lead actresses was still ongoing, and that there were no plans of making a Malayalam version of the film, despite speculation.

[citation needed] At the event, Kalyani Priyadarshan and Kriti Kharbanda were announced as two of the lead actresses, with Karthik suggesting that the storyline travels from "Chennai to Kolkata" and that the film would be "along the lines" of Jab We Met (2007).

[15] In late June 2021, Viacom18 Studios in association with Rise East Entertainment, relaunched Karthik's directorial debut, with the title being changed to Nitham Oru Vaanam, from Vaan.

Music composer Gopi Sundar and editor Anthony also joined the project, replacing Dheena Dayalan and Sreekar Prasad.

[17] Cinematographer George C. Williams was replaced by Vidhu Ayyanna due to the extensive delays and schedule conflicts.

[18] Dharan Kumar composed the background score and a promotional song "Thada Buda Kaathu" sung by Aparna Balamurali.

[24] M. Suganth of The Times of India rated the film 3 out of 5 stars and wrote "By the end, just as we expect, Arjun learns to be positive".