A seven-year-old spends time happily with his father and step mother. But with the birth of a new baby in the family, he's unable to tolerate the competition for parental love, and kills the newborn.

Nallamuthu and Vadivu face several hardships due to the rising poverty and are forced to send their three children to work as child laborers.

Chakravarthy is a conman who marries women for their money and jewels and later kills them. Seetha falls in love with him and looks forward to marrying him. But then she learns the truth about him.

Radhika, a rich woman, falls in love with Sudhakar, a poor young man, and gets married to him. However, her life is shattered when Sudhakar elopes with five lakh rupees soon after their marriage.

The movie starts with a flashback where Saravanan (Uday) and Parthasarathy (Santhanam) work at a popular multiplex and are close buddies. Saravanan's mother (Saranya) is innocent and strives hard for over twenty years to get his graduation, since it is her husband's (Azhagam Perumal) dream desire. One day, Saravanan sees Meera (Hansika) at a traffic signal and it is love at first sight for him. He desperately runs behind her to win over her heart. He even takes the help of his friend Partha. But all their plans fail. As it happens, it is a cat and mouse game between the two. But things take a turn and Meera's wedding gets fixed with an industrialist's son.

Kannadi Bommaigal portrays the life of a young man who moves to Chennai with his newly-married, with the aspiration of becoming an actor. "The protagonist Guna, a Therukoothu artiste, turns into a lightman when he doesn't find opportunities to act and he ends up working as a light-man for 25 years.