Singaravelan aka Singam (Vijay Sethupathi) was born during a political rally and believes that he is destined to be a politician. He tries his best to win the trust of his idol Rayappan (R Parthiban), a powerful politician. In the process, he sidelines Mangalam (Bhagavathi Perumal), who is a close aid of Rayappan. This provokes Mangalam who physically assaults Singam, leading him to have a split-personality disorder.

However, Singam’s eventual acts strain his relationships with his younger sister Manimekalai (Manjima Mohan), and lady love Kamatchi (Raashi Khanna). What happens next forms the crux of Tughlaq Durbar.