The story is based on a high profile case handled successfully by the Tamilnadu police force in the 90s. The screenplay is written based on the true incidents happened during the said case period which has been a long time research of the director.
Did You Know?
Karthi is doing a cop role after Siruthai. Theeran is based on true events happened in Indian during 1990s. The movie is filmed in Jaisalmer (Rajasthan) for 45 days and most of the action sequence was done under scorching sun. For first time Karthi and Rakul Preet Singh are pairing in this movie. Though it's a crime action thriller movie, romance is also worked out great. After huge success of Sathuranga Vettai, this is the second movie for the director H. Vinoth.
The official letter recommending for Rajasthan police's co-operation has the pin code of Rajasthan incorrect.
Theeran: When I was 5, my dad who went out to get chocolate wearing his uniform, never returned. My mother never let me realize that as a personal loss. Not everyone is lucky to lose life in the line of duty. She raised me keeping my dad as an example. Till date, I can proudly say, I'm his son. It should be the case with my children too. It's not anger nor a revenge. If we get off this case, we both... will regret entire life that we didn't perform our duties well.