Sachein

Sachein arrives at the college in Ooty and is instantly drawn to Shalini when he sees her for the first time. He is carefree and openly confident, setting the tone for his college life. The campus buzzes with a mix of curiosity and anticipation as a new term begins.

Ayyasamy fills Sachein in on Shalini's popularity and the fact that many boys try to win her attention. This prompts Sachein to adopt a teasing approach, attempting to mock Shalini in public to test her reaction. The early dynamic on campus is tense and playful at the same time.

Sachein comes to Shalini's aid when her father is involved in a bike accident, and his quick intervention helps ensure her father's safety. This act sparks the first real bond between them and starts softening their awkward dynamic. The incident happens on the city streets near the college.

Santhanam, who loves Shalini, grows jealous and scribbles a message on a college wall claiming Sachein loves Shalini. Shalini misreads the act as Sachein's confession, which triggers a heated confrontation between her and him. The campus wall becomes the flashpoint for their misunderstanding.

Shalini confronts Sachein and learns he did not write the wall message, though the message reflects his true feelings. This revelation clears the misunderstanding but intensifies the emotional tension between them. Their bond grows warmer as they work through the confusion.

Despite the rocky start, Sachein and Shalini gradually become good friends, sharing moments of trust and humor. The friendship lays the groundwork for a deeper romance as they navigate college life together. The shift happens over the next few days on the campus.

Manju confesses she likes Sachein, which stirs jealousy in Shalini. Manju hints that Sachein loves Shalini, pushing Shalini to acknowledge her own growing feelings. The emotional stakes rise as love starts to feel more real.

Sachein discovers that Shalini's parents have arranged a marriage for her, and he tells her that the 30-day challenge is over as he plans to leave Ooty the next day. This creates a sense of urgency for both of them to confront their feelings. The looming departure adds pressure to their evolving romance.

Shalini decides to propose her love the next day, hoping to win the unwritten challenge by not revealing her feelings within the 30 days. She resolves to keep her pride in check and let action speak louder than words. The strategy reflects her inner conflict between ego and love.

On the 31st day, Shalini rushes to confess but runs into Sachein's father Gowtham, who reveals that Sachein is the son of a billionaire. The revelation shocks the entire college and makes Shalini pause, rethinking how wealth might influence their relationship. The dynamic shifts from rivalry to reflection.

Sachein heads to Coimbatore International Airport, and Shalini follows him, unable to fully resolve her feelings. The pursuit sets the stage for a decisive moment between them, with emotions running high as they approach the final scene. The setting moves from campus to the airport corridor.

At the airport, Shalini finally confesses her love and proposes to Sachein, admitting that her ego briefly held her back. Sachein receives her confession with joy, and the couple is united at last. The moment seals their romance after a journey of misunderstandings and growth.