The film stars Sidharth Malhotra and Parineeti Chopra, along with Adah Sharma, Manoj Joshi, Sharat Saxena and Neena Kulkarni.

[3][4] Marking Malhotra's reunion with Dharma Productions, as well as Chopra's first project outside her Yash Raj Films collaborations, Hasee Toh Phasee follows the story of Nikhil, a struggling businessman who, believing he is in love with Karishma, an actress he is engaged to, has to prove his worth to his father-in-law while grappling with the sudden return of his fiancee's geeky sister, Meeta, who he had an encounter with years ago, throwing all of them into uncharted waters as he gets to know Meeta better.

It mainly received positive reviews from critics, with praise for its story, music, humor, cinematography and cast performances, particularly Chopra's, and earned ₹63.38 crore worldwide, thus emerging as a moderate commercial success at the box office.

Nikhil believes that once committed to a girl, there should be no straying, so he asks Karishma's father, Devesh, to help him with ₹50 million before marriage to earn a contract.

She ran away seven years ago to China via Goa, Nikhil inadvertently helping her while declining her offer to accompany, after stealing money for her project from Devesh, leading him to suffer a heart attack on the day of Karishma's elder sister Deeksha's wedding.

He learns that Meeta has returned, intending to steal again, and has taken a hefty loan of ₹100 million from a Chinese investor for her research by forging Devesh's signature.

Karan Johar's Dharma Productions along with Anurag Kashyap, Vikramaditya Motwane and Vikas Bahl's Phantom Films, announced that they would make a romantic comedy together.

[9] Anurag Kashyap said, "The story works with fresh faces, but requires a high level of chemistry and maturity in the performances.

The makers of the film created a web application through which people across the country will try to make Chopra laugh under her co-star Malhotra’s guidance.

The remix version of "Drama Queen" was later uploaded as a single on the official YouTube channel of Dharma Productions.

Joginder Tuteja of Rediff.com termed "Ishq Bulava" the best love song and noted, "The music of Hasee Toh Phasee delivers more than it promised at the outset.

"[30] Seema Sinha of Times of India stated, "The music of the film also seems to be refreshing, with a nice blend of foot-tapping dance numbers and romantic ballads.

"[31] NDTV noted, "The musical duo Vishal-Shekhar have ensured the songs capture the right essence to mesmerise the young crowd.

"[32] Bollywood Hungama liked the songs "Manchala" and "Zehnaseeb", but added, "Vishal-Shekhar have done better than in some recent soundtracks, they should get more serious about their do's (strength and freshness in compositions) and don'ts (poor mixing and over-orchestration).

[41] Meena Iyer of The Times of India gave it 3.5/5 stars, stating, "Hasee Toh Phasee is for the romantics who like their martinis stirred not shaken.

This romantic comedy mirrors the quirks in human nature subtly and provides humour in everyday situations; in the family and amongst friends.

[43] Sukanya Verma of Rediff with the same ratings wrote, "Hasee Toh Phasee is that rare film that allows you to know the two people you're investing in.

"[44] Mohar Basu of Koimoi gave it 3/5 stars and wrote, "The film is both pleasantly surprising and utterly baffling in equal amounts.

Hasee Toh Phasee will definitely win your heart for the symbiotically arranged, pitch perfect chemistry of Parineeti Chopra and Sidharth Malhotra.

"[45] A review from India Today rated it with 3/5 stars, stating, "Hasee Toh Phasee is a refreshing, much-needed entry in the contemporary romcom genre, which has lately seen a series of uninspiring films.

It's largely to do with the presence of an unseen pairing with great chemistry - Parineeti Chopra and Sidharth Malhotra - and Mathew and writer Harshvardhan Kulkarni's perky take on love.

"[46] Tushar Joshi of Daily News and Analysis gave the movie with 3/5 stars, writing, "The lead pair of Chopra and Malhotra make Hasee Toh Phasee enjoyable and believable.

[48] According to Box Office India, Hasee Toh Phasee had a reasonable start in major metros in most parts of the country.

In the second week, the movie's screen count fell due to the release of Yash Raj Films' Gunday.

[73][74] Vibha Maru from The Indian Express noted, "What makes Hasee Toh Phasee unique is the character arc of its two leads.