Dayalan (Samuthirakani) is employed as a Tamil lecturer in a private arts and science college who is well-respected and loved by all the students for his caring approach, friendly nature, and open-mindedness towards students' empowerment. However, most of Dayalan's colleagues hate him, including the college principal Singaperumal (Thambi Ramaiah). Pazhanimuthu (Yuvan), who happens to be the only son of Singaperumal, falls in love with his classmate Podhumponnu (Athulya Ravi), but he does not have the courage to confess his love. Podhumponnu has a good image over Aadhi (Kaushik Sundaram), her classmate who hails from a poor family background. The college is divided based on two prominent caste groups, resulting in frequent clashes between students belonging to the respective castes. Dayalan tries hard to calm down students and instigate them to stay united despite coming from different caste backgrounds, which he accomplishes successfully. Dayalan also falls in love with his colleague Pachiammal (Rajshri Ponnappa), who shares his same ideologies, and they eventually get married.

Dayalan comes up with a plan of forming a group called “Students Parliament” whereby students should take responsibility in managing day-to-day activities of college such as cleanliness, infra facilities, etc. While Singaperumal and other lecturers hate this idea, local media channels appreciate Dayalan's efforts, thereby gaining a good image for the college. Dayalan also initiates a plan of arranging campus interviews for their students similar to engineering colleges so that students hailing from poor backgrounds should get benefited. Dayalan takes the necessary steps and meets different organizations, inviting them for the placement process in which he succeeds as well. This is also set as a good example for other arts and science colleges. Meanwhile, Aadhi gets a good job offer and dreams of improving his family's financial status.

Lecturers who were against Dayalan's ideologies understand him well and decide to stand with him, but still, Singaperumal's ego does not let him support Dayalan. Singaperumal starts showing his anger towards students more often and sends Aadhi out of his class. Angered by this, Pazhani also leaves the class. They both travel on a motorcycle, but they meet with a major accident where Aadhi passes away and Pazhani is badly injured. Hearing this, Singaperumal feels guilty for his behavior and transforms. To everyone's shock, Aadhi's caste leaders rush to college and start protesting in the name of caste with plans of getting some money from the college management. Dayalan secretly records their conversation and sends it to all students, thereby exposing the real intentions of the caste groups. College students unite and kick the caste leaders out from their college campus. Singaperumal apologizes to everyone, taking responsibility for Aadhi's death, and promises to Aadhi's family that Pazhani will take care of them.