It stars Arun Vijay, Karthik, Prabhu and Dhansika, with Vijayakumar and Riyaz Khan playing supporting roles and Santhanam and Ganja Karuppu providing comical relief.

The film starts with Anjali escaping on a motorcycle from her enforced engagement with the assistance of the groom; however, DIG Easwarapandian sees her from his police car.

Past: Six months ago, ACP Bose was a sincere and happily married police officer.

She gets friendly with his daughter Pinky, who tells her that she will get introduced to her uncle Velu and that they will be a good pair.

The chairman of the chit fund, who lent ₹1,000,000,000 (US$21.5 million) for the deal, demands the money back as the agreement has not worked.

He burst into tears and revealed that Bose was dead, and he rescued his family under the supervision of the new DIG, Gautham Ganesh, who supported him wholeheartedly.

[3][4][5] Suresh Gopi was initially selected to play the role of Arun's elder brother[6] but he was replaced by another senior actor Karthik who made his comeback through this film.

[7][8][9] Dhansika, who was one of the five girls in Peraanmai has been selected to play the pair opposite hero making her first project as a solo heroine.

[12][13] The climax fight scenes of the film were canned in Ekkattuthangal Burma Colony Muneeswarar Temple, Chennai for the last 5 days and were shot using two outdoor units and four cameras.

The set was built like that of a ruined temple, with a 50 ft tall 'Aiyanaar' statue erected at a whopping 65 lakhs.

As he had spent Rs.2 crores till date, the producer told Vijay that he couldn't continue to shoot the film.

"Due to the mental harassment I had to endure because of Arun Vijay, I couldn’t continue my profession as a doctor for the past 4 years.

Vijay has to pay me Rs.1.5 crores and till he does so, the release of his ‘Maanja Velu’ should be stayed till the 19th of this month," he had stated in the petition[19] Dr. Mohan, producer of ‘Maanja Velu’ and father-in-law of Arun Vijay, had filed a counter petition with the Court praying for vacation of the stay on the grounds that he, as a producer, had nothing to do with Dr. Kalidoss’ case and requested that as such, his film should be allowed to release on the stipulated date.

As soon as the Judge announced that he'd be giving the verdict based on the ‘actual nature’ of the case, Dr. Kalidoss is said to have ‘withdrawn’ his petition from the Court.

[citation needed] Karthik Srinivasan of Milliblog said, "getting 3 decent tracks in a masala potboiler soundtrack is a huge win indeed".

[21] The film was released on 21 May 2010 alongside Magane En Marumagane, Kanagavel Kaaka, Kutti Pisasu, Kola Kolaya Mundhirika and Kutrapirivu.

[26] The Times of India said, "The one thing that strikes you about Maanja Velu is what a talent house Tamil cinema has been.

As you watch the parade of the seniors like Karthik, Prabhu, Vijaykumar and Vagai Chandrasekhar you feel glad that they came up with good, great, moving or simply lovable performances in the past.

[27] Chennaionline said, "Maanja Velu has all the ingredients of a masala flick but the problem is that it has no novelty or neatness to impress us".