The film opens with two friends "Billa Kesavan" aka "Theni" Kesavan (Vimal) and "Ranga Murugan" aka "Pattai" Murugan (Sivakarthikeyan), who are unemployed and want to become politicians. Meanwhile, Murugan meets Parvathy aka Paapaa (Regina Cassandra) and falls for her. On the other side, Kesavan meets Mithra Meenalochini (Bindu Madhavi) and falls for her. Paappaa and Mithra too fall for them after many confusions. There comes the Councilor Election, and Murugan stands for it. Paappaa gives Murugan money to spend for the election. Eventually, Murugan loses in the election. Seeing this, his father Aachivardham (Manoj Kumar) dies by falling off of the train platform. Due to this, Murugan gets his father's job. In the meantime, Kesavan marries Mithra. Murugan and Paappaa wait for the acceptance of their parents. Their parents accept for their marriage, and they get married. Soon, Murugan and Kesavan realise the real value of the life, and they decide that life is nothing without doing work, so they both go to their respective homes. While seeing their fathers' photos, Murugan and Kesavan write "DAD IS MY GOD" and "MY FATHER IS HERO" respectively.