The film stars Pratheek and Akshatha Sreedhar, with an ensemble cast of actors including Madhu Soodhanan, Mime Gopi, Sai Dheena, Appukutty, Imman Annachi, Pavel Navageethan, and Ramachandran Durairaj in pivotal roles.
Hari Uthraa scripted the film and based the key plot points around corporate interventions and issues that farmers face due to it.
The critic added that "the use of fractured timelines is what makes Theru Naaigal different from the umpteen ones we have seen till date" and "this approach keeps us guessing about what is at play and what is at stake, and the film remains engaging for the most parts".
However, the critic stated "what stops the film from being truly good is the flashback portion that is a bit too long and digresses a little to include a romantic track, which seems to have been added on as a compromise".
[4] Rakesh Mehar of NewsMinute.com stated "Theru Naaigal tries for gritty realism, but ends up delivering a single-tone film that drags beyond its actual runtime", adding "not that Theru Naaigal doesn't have the ingredients for a good film", "it is moderately engaging but fails to engage fully because it overplays its hand — and with a subtler touch and a little restraint, it could make for great viewing".