Swaminathan

Bhaskaran (Arya) is a happy-go-lucky guy, who is yet to complete his B. A. Degree, writing arrear examinations annually for years. His only friend is Nallathambi (Santhanam) who owns a Hair Cutting Saloon named Thalai Thalapathi Saloon which he received as a dowry for marrying a two-month pregnant woman. Bhaskaran lives with his mother, Sivakami (Lakshmi Ramakrishnan), brother Saravanan (Panchu Subbu) who is a successful veterinarian and sister, Nithya (Monisha). (wikipedia)

John (Arya) & Regina (Nayanthara) marry each other as total strangers to please their parents. After marriage, they behave with hostility to each other, but each of them had a failed pre-marriage love story to tell - Regina's cowardly boyfriend Surya (Jai) runs off to the US on their marriage day & commits suicide there & John's girlfriend Keerthana (Nazriya Nazim) dies in a road accident. After hearing each other's stories, they start to develop feelings for each other.

Ganesh clashes with a trio of criminal brothers when he tips off the police about them. When they try to seek revenge, they realize he has a score to settle with them too. (imdb)

Ajay (Shiva) & Anjali (Priya Anand) are swindled by house agent Narayanan (Santhanam) & end up renting the same apartment. They decide to stay in the apartment until they can track down the agent to get their money back, but soon fall in love.

https://en.wikipedia.org/wiki/Draft:Inga_Naan_Thaan_Kingu