Vaanar Clan's prince, Vallavaraiyan Vandiyadevan to investigate and relay the news to his sister Princess Kundavai and Sundara Chozhar subsequently. Vandiyadevan reaches the fortress of Kadamboor and overhears the conspiracy devised by the treasurer and minister of finance, Periya Pazhuvettaraiyar and other ministers to stop Aditha Karikalan from ascending the throne and install his uncle Madhurantaka Chola on it. Vandiyadevan had frequent meetings with a Vaishnavite Azhwarkkadiyan Nambi, whom he spots at the fortress spying on the meeting. After escaping from the fortress, Vandiyadevan confronts Nambi on a boat, who reveals that he was in the fortress to meet his foster sister Nandini, who mysteriously disappeared from the house during his absence and later married Periya Pazhuvettaraiyar, who is much older than her. After learning this, Vandiyedavan meets Pazhuvettaraiyar's wife Nandini, who tells him to meet her at her building and gives her ring to him for entry into the royal palace when he expresses that he wants to deliver Nambi's message to her. Vandiyedavan meets the fort's chief-in-charge Chinna Pazhuvettaraiyar and reveals to Sundara Chozhar about the conspirators, but Chinna Pazhuvettaraiyar, who is Pazhuvettaraiyar's younger brother intervenes and tries to capture Vandiyedavan, who manages to escape from them and meets Aditha Karikalan's sister Kundavai through Nandini, who orders him to bring her reply first to her before reaching Aditha Karikalan. After learning about the conspiracy, Kundavai (on whom Vandiyadevan begins to develop feelings) tells him to bring Ponniyin Selvan from Lanka. After winning the battle in Kanchi, Aditha Karikalan is told to return to Thanjavur but refuses as Nandini is present in Thanjavur. It is revealed that Aditha Karikalan was in love with Nandini, but the royalty refused to accept a poor orphan as the prospective queen of the Chola empire and banished her from the city. After years, Aditha Karikalan met Nandini tending to his enemy Veerapandiyan, who was the king of Pandya dynasty with whom she fell in love after being banished. In a fit of rage, Aditha Karikalan beheaded Veerapandiyan causing a depressed Nandini to swear vengeance against his family. Presently, Aditha Karikalan knows that Nandini married Periya Pazhuvettaraiyar just to avenge her past. After winning the war against Raja Mahinda in Lanka, Ponniyin Selvan meets Vandiyadevan, who relays messages for him from Kundavai and Vaanathi (Ponniyin Selvan's love interest and Princess of Kodumbalur) by reaching Lanka with the help of a rowing woman Poonguzhali. Nambi