In 1996, an 18-year-old Muthupandi visits the local police station in Kovilur, Thenkasi over a small issue. He earns respect there because his grandfather was an MLA from the ADBD party, a national outfit. Feeling the pull of politics, he naively joins ADBD, unaware that the party has little real foothold in Tamil Nadu. He tries to woo his college senior Madhavi, but ends up in a clash with supersenior Ravikumar, and he loses the chance at love.
Twenty years pass, and Muthupandi remains unmarried. He has risen to the position of State General Secretary in a meek party, with a modest family setup: a younger brother who is married with kids and works as a government employee, and a younger sister still in college. The family’s income comes from ancestral properties, and Muthupandi relies on various tricks and tactics to keep the party’s name alive despite near non-existent funding. His assistant Kumar sticks by him, hoping for a big break.
Bullet Marudhupandi serves as Vice-Chairman of Kovilur Municipality and has been contending for an MLA seat for a decade. Despite his influence within the ruling MMSK party, he laments that the seat is allotted to coalition partners. He appoints a rubber-stamp lady as Chairman to satisfy the women’s reservation, effectively running the administration. Vanjinathan, the younger brother of Marudhupandi, is a key figure in the opposition MMKK party and has twice fallen short in the same constituency. Although they sit on opposite sides, they cultivate a secret rapport and together dominate civil contracts.
Muthupandi meets a young woman named Maya and falls in love with her. When he goes to meet her parents, he discovers that Maya is the daughter of his earlier crush Madhavi and Ravikumar, now a Police Inspector, who vows not to let Maya be married off to Muthupandi. At the same time, general elections are announced for the state. To hit back at the tricks pulled on him, Marudhupandi and Vanjinathan arrange for Sanjay, a London-returned NRI, to marry Maya on the day results come in, since Ravikumar is their distant cousin.
In Chennai, Muthupandi encounters the State President Gopi, and they meet with Saamy, the PA of their National President Sharma. Saamy conveys Sharma’s desire to strengthen the party in the South after the elections. He offers Muthupandi the chance to become an MP in the Rajya Sabha from Assam and then a central deputy-minister, since Muthupandi knows Hindi. In return, Muthupandi suggests reclaiming Gopi’s home-seat Tambaram as MLA for their side. Gopi, eager to become an MP, double-crosses Muthupandi and meets the Chief Minister, the MMKK President, who reallocates Kovilur to their party. Muthupandi is shocked and hatches a new plan.
Determined, Muthupandi declares he will lose the election and then pursue the MP path. Gopi convinces a distressed Marudhupandi to work for Muthupandi, paying him handsomely, while Vanjinathan campaigns vigorously for the MMKK. The election day arrives, and Muthupandi wins by about 2,000 votes, securing the MLA seat. He reveals to Kumar that the MP-deputy-minister plot was a staged drama designed to win. In the final tally, MMKK and MMSK win 117 and 116 seats respectively in the 234-member assembly, placing Muthupandi in a pivotal decider role given his party’s symbol.
Meanwhile, Sanjay bolts from the wedding, and Ravikumar is pressured by relatives to marry Maya to MLA Muthupandi. Ravikumar agrees, though reluctantly, and Muthupandi marries Maya. The MMKK offers him the Khadi Minister post in the new cabinet in exchange for support, but he declines and instead offers his allegiance to MMKK, keeping his eyes on the Revenue Department, the wealthiest portfolio.
Three days later, Muthupandi, Maya, and Kumar travel to Chennai for government functions. He arranges for his brother and sister-in-law to be transferred back to Kovilur to be closer to their mother. Sanjay reappears, meeting Muthupandi and Maya at Madurai airport and reveals that he, too, was part of Muthupandi’s ruse to win Maya’s hand. At last, Muthupandi opens up to Maya, who forgives him, and they reconcile. A call from the Chief Minister’s office soon follows, confirming that Muthupandi has been appointed to the Revenue Department portfolio.
