If You Know Me) is a 2015 Indian Tamil-language action thriller film written and directed by Gautham Vasudev Menon and produced by S. Aishwarya.

During the flight, she starts vomiting due to overeating, but she feels better with the help of her co-passenger, Sathyadev, and she develops a crush on him.

Two years later, in an attempt to nab a gangster at Egmore Railway Station, Sathya helps a pregnant woman named Hemanika, who immediately needs to get to a hospital for delivery.

On the eve of their marriage, Hemanika is brutally murdered, which leaves Sathya heartbroken, but Isha is saved as she was with him that night.

Sathya decides to quit his job and travels with Isha around India, with his colleague DCP Richard's help.

[citation needed] On 29 October 2014, Suresh Chandra, Ajith's agent, confirmed the title for the film to be Yennai Arindhaal (Well, if you know me...).

[14] The title of the dubbed Telugu version was announced as Entha Vaadu Gani (No matter how strong the opponent is...) along with a few poster designs on 23 November 2014.

[citation needed] Anushka Shetty was signed on by the team to play the main lead, despite early suggestions that Amy Jackson had been selected for the film.

[15] Prior to the official announcement of the cast, several actors were linked to portray the role of the antagonist in the film, including Karthik and Prashanth.

[16] Actors Aadhi, Arun Vijay, and Arvind Swamy were also reported to be part of the cast, though the latter denied signing the film.

[20] On 18 April 2014, comedian Vivek joined the cast, collaborating with Gautham Menon after the director's first venture Minnale (2001).

[21] Trisha was officially cast as another lead of the film, collaborating with Gautham Menon for the second time after Vinnaithaandi Varuvaayaa (2010).

[25] Parvathy Nair was cast in a role paired opposite Arun Vijay,[26] making this film the second she signed in Tamil, after the later-released Uttama Villain.

[32] Trisha said that her portion in the film would have a more intense love story than her last outing with Gautham Menon, Vinnaithaandi Varuvaayaa (2010).

[33] For Trisha's character of Hemanika, stylist Uthara Menon made dresses out of Kanchi cottons and used retro brocade for her dance costumes, while basing her look on actress Shobana.

[40] A. M. Rathnam issued an official statement confirming that the film would be launched on 9 April 2014, and a ceremony was thereafter held to mark the beginning of the project.

[48] Shooting continued in Chennai along the ECR stretch up to the first week of August,[49] during which the portions involving Baby Ankitha were completed.

[54] Filming then proceeded in Sikkim, where a "lullaby" song sequence featuring Ajith and Baby Ankitha was shot.

[57] By late November, the shoots of all the songs have been done, and a fight sequence was shot in Binny Mills in Meenambakkam, Chennai.

In early December, shooting of the climax chase sequence was done in guerrilla filmmaking mode in some busy roads of Chennai without the knowledge of the public.

[65] Harris said that he had recorded a fresh voice from the United Kingdom for the first song in the film,[66] which was later revealed to be Kharesma Ravichandran.

[84] However, a still featuring Ajith in his black haired look was released instead, where he was pictured riding a Royal Enfield Bike.

[96] In March 2015, the website Herotalkies.com (VS Ecommerce Ventures) legally released Yennai Arindhaal online in Full HD 1080p with English subtitles, but only for audiences who live outside India.

Karthik of CNN-IBN gave 4/5 stars and stated "Ajith as the cop, the gangster, the father, and the lover will win you over".

[99] IANS gave 3.5/5 stars and wrote "Despite some tonal and length issues, Gautham impresses mostly in Yennai Arindhaal and gives this tale of a police officer a much need emotional tug".

[100] Karthik Subramanian of The Hindu wrote "Performances lift an otherwise predicatable fare from Gautam Vasudev Menon".

[30] Sudhir Srinivasan of The Hindu wrote "A rushed climax, a problematic organ trafficking angle, a repeated plot device, a predictable ending… and yet Yennai Arindhaal comes as a breath of fresh air...There's just that one thin line that stops it from being terrific".

[101] Sify gave 3/5 stars and wrote "Watch Yennai Arindhaal for Ajith’s majestic screen presence and the underlying emotional current".

[102] Rediff gave 3/5 stars and wrote, "The backdrop of Yennai Arindhaal is new and the plot is engaging, but the characters, the situation, and even the dialogues are reminiscences of director Gautham Menon's previous cop films".

[103] Indiaglitz gave 3.25/5 stars and wrote "Barring the nostalgic moments from his previous movies and the slow screenplay, Yennai Arindhaal is a rock solid entertainer with enough scenes to get you hooked".