Veerappu movie is the remake of Malayalam movie Yutham. Vedhakkannu (Prakash Raj) is a high school teacher who is known for his hard disciplinary ways. He has won the President’s Award for Mathematics. He doesn’t even spare his won son from his being punished. He always says that his son is the real culprit behind all the mischief that happens in the class. So he punishes him until he finds out who really played the prank.
Due to this harassment by his father, Vedhakkannu’s son turns against him and always opposes his father whatever he does. His fear of his father makes him bad at maths. He is good at science and electronics. One of his hobbies and talents is making electronics gizmos – something that his father refuses to acknowledge.
The refusal that he gets at home from his father makes him a rowdy and he runs away from his family. He meets and falls in love with his one time classmate who turns his heart back towards his father and who helps him mends his ways.