Irumban is a love story between a poor boy and a rich girl. Will it work out for them?

Ambedkar (Samuthirakani), a social activist, gets involved in the dark side of the government. As a result, his son and friends are killed. A lower caste individual (Nitish Veera) desires to marry a girl from a higher caste. A woman (Chandini Tamilarasan) leaves for Chennai to marry the man of her choice. A man (Munishkanth) is in need of Rs 20,000 to save his son’s life. How these separate stories interact forms the rest of the story.

Vetri, an aspiring director, wants to finish his dream script but he is constantly disturbed by his roommates. Problems arise when the story he weaves about Merlin, an imaginary ghost, comes to life.