Rajan Vasudev (Kalabhavan Mani) is an intolerable business tycoon who runs the great OPM Group of companies spread across the globe. He meaninglessly topples companies by either buying or taking the majority shares so that his company can spread across. His wife was killed 20 years ago by a rival company owner, which turned him into this way. Udhay Vasudev (Vinay Rai) is his only son, a spoilt kid who drives a Ferrari, spends lakhs everyday, and lives in one of the most sophisticated houses in Chennai. He is the sponsor for his constant companion Madhan (Yuva), who lives with him and local friend Kadukku (N. Santhanam) along with 12 bodyguards (headed by Alse Ram). Udhay meets LR Easwari (Kajal Aggarwal), a music student in Chennai in an accident and falls head on for her. He wants to mingle with her and blackmails her by saying that she has damaged his car and could work by his will to compensate the 10 lakh she owes him, and in a funny turn of events, he makes her his maid-servant. Soon, Madhan falls in love with Easwari, who has also fallen for Udhay.

Surya (Ramesh), an introvert by nature loves his classmate Priya (Pooja) from childhood but has never expressed his feelings towards her. Meanwhile, Surya’s another classmate Ajay also tries to woo Priya in which he succeeds to an extent. Priya does not like Surya as she views him as a nerd. One day, Surya gets frustrated as he is not being liked by anyone and cries loudly in a beach where he finds a small idol of a God. He holds the idol saying that it is better to be invisible in this world rather than being disliked by everyone.

Yaarukku Theriyum is essentially the story of five people who wake up from an unconscious state in a factory that is completely locked out and with no way for an exit. To add to their woes none of the five remember anything about themselves or how they landed up at the factory. The rest of the story is about what happens to them when they attempt to put the pieces of the puzzle together.

Bose (Srikanth) is an Army commando. When Union Minister Kottaiperumal (Kalabhavan Mani) is kidnapped by terrorists, Bose goes on a daring rescue operation and manages to pull it off, Kottaiperumal makes him his personal security guard. However, Bose gets to know Kottaiperumal’s real side. When Kottaiperumal tries to misbehave with a college girl Charulatha (Sneha), Bose rises up in anger. In trying to save her, he ends up shooting Kottaiperumal. Though he escapes with some injuries, Kottaiperumal gets Bose sacked from the Army. Distraught and disconsolate, Bose lands in Chennai and meets Charulatha, who is a student in Kalashektra. Upon meeting her, the duo falls in love. However, Kottaiperumal is waiting for revenge and has his goons on Bose and Charulatha’s track. After some fights, Kottaiperumal’s men bump off Bose’s father (Manikka Vinayagam) and kidnap his family members and Charulatha. By then, Bose also stumbles upon the links of Kottaiperumal. All ends well, and Bose is reinstated in the Army.