Azhagu Raja (Karthi), is the only son of the Muthukrishnan family. He owns an unpopular cable channel called "Triple A". The cable company has only two employees, Raja and Kalyanam (Santhanam). Nothing they do improves the company's fortunes. By chance, Raja meets Devi Priya (Kajal Aggarwal) when she is singing at a wedding. Her unusual voice irritates him and they argue. However, Priya eventually agrees that she cannot sing well. Priya says she fails at everything she tries, even suicide. As their friendship blossoms, Raja tells his father, Muthukrishnan, about Priya which triggers a memory in Muthukrishnan about his past.
He used to work for Burma Ramaswamy (Nassar) after being recommended by Kali (Santhanam), Seeing his hard work & dedication, Burma Ramaswamy promotes him to more responsible work in the theatre and appoints Kali under him. An enraged Kali,filled with jealousy plots to pit Burma Ramaswamy against Muthukrishnan & is successful when Muthukrishnan is ousted by Ramaswamy due to a misunderstanding.
Raja steps into Muthukrishnan's 1980s world. Muthukrishnan and Priya's father, Kandhaswamy reject Raja's marriage to Priya. Muthukrishnan and Kandhaswamy meet & realise that jealousy of Kali, Kalyanam's father was the reason for the problems of the families; finally Kalyanam tells the real story & both families unite to marry Raja and Priya