After a long break, the students of Siragugal school return to classes. With the help of his juvenile warden, Kalai gets a chance to restart his life.
Commotion builds as the students fight for the class leader position. Meanwhile, the school correspondent receives an alarming letter.
The old students of Siragugal dare the newcomers to play a game against them. The teachers await a shocking announcement from the principal.
Startled by the recent issue, Sakthivel approaches his son, Guna, for help. At school, the students meet again for a final rematch.
The people of Siragugal school encounter difficult and unpleasant situations simultaneously. Elsewhere, conflicts arise between Kalai and Gowtham.
While friendship seems to blossom between Guna and Malar, Kalai's first meeting with Abi's family goes wrong. Meanwhile, Sakthivel receives an offer from his rival.
Sakthivel loses hope as a staff member departs from the school. Guna faces an unexpected crisis at the bank.
Gowtham reveals Kalai's secret to the class. Amidst the ongoing confusion, Sakthivel announces his plan to celebrate Siragugal's silver jubilee.
In fear of losing their domination amongst their classmates, Gowtham and his team discuss a strategy. The principal plots to ruin the school function.
In a peculiar turn of events, Kalai gets framed for theft. Meanwhile, an unexpected guest visits Siragugal and the school is in for a surprise.
Abi reveals the truth behind the theft and proves Kalai's innocence. However, he faces a tough time as Gowtham's friends humiliate him at his workplace.
Sakthivel gets overjoyed as his former student Jerry returns to Siragugal as a teacher. On her way to school, Abi panics being followed by a certain someone.
Jerry wins the hearts of students with his unique teaching style on his first day. He also makes an attempt to reunite students for the upcoming school function.
Malar feels heartbroken as the information on Siragugal's ex-students gets erased. Nandhini goes into shock when she finds her mother in an unconscious state.
Jerry comes up with an idea to bring the ex-students together and shares it with Malar. Elsewhere, Aadhi troubles Abi and forces her to accept his love letter.
Abi's warning to Aadhi backfires as he threatens to commit suicide. On the other hand, Gowtham and his team learn about Siragugal's famous alumnus.
As Aadhi threatens to hurt himself, Abi reluctantly accepts his love proposal. Sagayam steps in to help Gowtham, and his friends contact Ashok, a popular celebrity.
Naachiyappan visits Guna with a compelling offer in order to persuade his father to hand over Siragugal school to the former. Sagayam and students make an attempt to meet Ashok.
Abi gets heartbroken when Aadhi threatens to share her photographs on social media. At school, Jerry employs his methods to encourage cooperation between Kalai and Gowtham's teams.
The principal provokes the students' parents to give complaints about the school and management to Sakthivel. Kalai gets worried about Abi and pays her a visit.
When Aadhi tries to misbehave with Abi, Kalai shows up and saves her. Malar visits Guna at his house to obtain photographs of Ashok.
After learning the truth, Sakthivel counsels Kalai and urges him not to repeat the mistake. Gowtham's friends get suspicious when Sagayam claims to have received a call from Ashok.
As the warden condemns Kalai for his misbehaviour, he promises to control his anger. Shocked by the viral response to Ashok's post, Gowtham rushes over to inform Jerry about it.
On seeing Sakthivel happy, Malar decides to hide the second warning letter from him. Kalai gets into a pickle when a vendor backs out of the function at the last moment.
Happiness knows no bounds for the people of Siragugal as the alumni attend the silver jubilee event. While Guna and Bullet spy on the guests, a special someone interrupts them.
Sakthivel appreciates the students for making a grand and nostalgic arrangement for the event. Meanwhile, Malar and Gowtham begin to panic as they are unable to contact Ashok.
Nandhini gets nervous when she sees the audience but gains confidence after recalling Gowtham's remarks. Ashok, the rockstar, arrives at the event and shares his school memories.
Although Sagayam assumes rockstar Ashok has forgotten about him, he gets a pleasant surprise. The next day, a DPI officer meets Sakthivel to seal the school's fate.
The students' parents visit Sakthivel to demand answers about the school's current situation. Meanwhile, Aadhi's brother, Vedha, goes to Kalai's hotel with sinister intentions.
Noticing Sakthivel's worry, Jerry offers him a solution to the school's problems. On the way to school, Nandini gets stopped and ordered around.
A misunderstanding forces Sakthivel to chase Guna out of his house. Elsewhere, Kalai lashes out at Abi when she asks him to accompany her to the police station.
On learning about Guna's love and admiration for him, Sakthivel feels terrible. Gopi and the others devise a scheme to help Kicha with his love life.
Sakthivel is taken aback when he learns that Raghu has applied for a huge loan. While the students mock Attai Poochi, the peon enters the classroom with the fee defaulters' list.
Sakthivel plans a trust game with his sons, Guna and Raghu. Parvathy is taken aback when her parents suddenly arrange her engagement.
Jerry gets enraged when he spots the fee defaulters' list in the classroom and discards it. On his way to the bank, Sakthivel meets with an accident.
Malar informs Raghu about Sakthivel's condition. Soon after, Abi and the other students request Jerry for permission to visit Sakthivel.
Kalai and the others arrive at the hospital to meet Sakthivel. To everyone's surprise, Sakthivel makes a shocking announcement regarding his successor.
Once Sakthivel hands over the reins of his beloved Siragugal, its staff and students have to deal with a devastating loss.
Guna's decision regarding Siragugal's next correspondent baffles Jerry and Malar. Elsewhere, Gowtham suggests a solution for Nandini's scholarship issue.
Nandini makes a vain attempt to discuss her school fees with her mother. On the other hand, Raghu and his co-conspirator meet with intentions to close down Siragugal.
Master extends his help to pay Kalai's school fees. Sagayam interrupts Malar and Guna with alarming news about Nandini.
On seeing Nandini, Jerry recalls the tragic incident that occurred to his friend Sanghavi. Along with Guna, he devices a plan to rescue Nandini.
