Plot
In 2014, D. Ragavan, a diligent 12th-standard student, wins a gold medal in computer science. Encouraged by his achievement, he confesses his feelings to his crush, Anjana, but she rejects him, preferring rebellious boys over well-mannered ones like him. Ragavan then transforms into a rebellious student, adopting the moniker "Dragon". With his friend Anbu, he builds a notorious reputation at AGS Engineering College in Vellore, accumulating 48 arrears. Despite his poor academics, he earns the respect of his peers.
During a college fest, Dragon gets into a fight and is suspended. Dean Mayilvahanan offers him a chance to redeem himself, but Dragon declines. After leaving college, he deceives his parents into believing he has an IT job, funding a small allowance through his friends and girlfriend, Keerthi. However, Keerthi ends their six-year relationship upon receiving a good marriage proposal, calling Dragon a failure due to his arrears and lack of independence. After a drunken accident, Dragon reassesses his life and sets a goal to earn a salary higher than what Keerthi's prospective groom Deepak earns.
Anbu and Dragon befriend Gowtham, a wealthy man who reveals he secured a job using a fake degree provided by an agency. Inspired, Dragon seeks one from the agency, whose managing director M. S. Rajesh asks ₹1,000,000 (US$10,000). Dragon manipulates his father, Dhanapal, into selling their land to raise funds. With the money, he obtains the degree and cheats in a video interview with Vale Kumar, the CEO of a multinational corporation. Dragon lands the job with an annual salary of ₹1,600,000 (US$17,000).
Dragon performs well at work due to his computer science background and earns multiple promotions within three years, securing a transfer to the United States. He buys a lavish villa and car, impressing businessman Parasuram, who arranges his daughter Pallavi's marriage with him. Dragon and Pallavi fall in love. However, Mayilvahanan spots Dragon in his car and confronts him. Forced to confess his forgery, Dragon begs Mayilvahanan to stay silent. He agrees, provided Dragon clears all arrears in a single attempt within three months. Fearing job loss and wedding cancellation, Dragon accepts. He secures a three-month work-from-home arrangement, lying to Vale about marriage commitments, and to his family about a training program in Mumbai.
Returning to college, Dragon struggles to adapt. Meanwhile, Kutty Dragon (transl. Little Dragon), a junior inspired by his notorious reputation, causes chaos. Dragon considers quitting but reconsiders after learning of Gowtham's arrest for his fake degree. Determined, he prepares for exams with help from Keerthi, now a lecturer. They reconcile as friends, with Keerthi expressing guilt over their past.
Before his final exam, Pallavi arrives in Mumbai to surprise him. To maintain his lie, Dragon says he came to Chennai to surprise her. She returns to Chennai, and Dragon rushes from Vellore to Chennai to meet her, then back to college. However, he struggles to write during the exam due to exhaustion and lack of sleep and goes to the washroom to refresh. Later when Vale initiates a background verification process on Dragon, the exam results are announced and Dragon is listed as having cleared his arrears, securing his job.
On his wedding eve, Dragon and Kutty Dragon visit their classmate Venkat, who attempted suicide after failing a subject. Venkat, who is poor, reveals that someone swapped their answer sheet with his, which cost his Google job offer. Dragon feels guilty; at the washroom, he had secretly called Rajesh to swap the answer sheets but did not anticipate Venkat as his target. The next day, overwhelmed with guilt, he stops his wedding and reveals the complete truth to Vale, Mayilvahanan, Pallavi and his family. He surrenders to the police and serves six months in prison while Venkat secures his job at Google.
Upon release, Dragon is accepted by his parents and starts working as a food delivery agent with a modest salary, while resuming his education with a correspondence course. Impressed by his reformation, Mayilvahanan offers his daughter Harini's hand in marriage. Initially hesitant, Dragon is smitten by Harini upon seeing her.
