Thanthonni, which means someone who is headstrong and does things on his own without caring about others. The film is about Kochukunju (Prithviraj) who is the youngest member of the wealthy Vadakkan Veettil family. He happens to be a brat who is living life on his own terms. It is a huge household where he lives with his mother, three uncles and their families. All in the family are well-placed and rich, except for Kochukunju, who has been a troublemaker right from his childhood.