The film stars Yuva Karthik, Ajay and Karthika, with Karunas, Radha Ravi, Devan, Singamuthu, Bava Lakshmanan, Muthukaalai and Sampath Ram playing supporting roles.
[1] The film begins with Subbu (Ajay) killing Suruli (Sampath Ram) in Kodaikanal and he starts remembering his past.
In 1992, Subbu (Yuva Karthik) was a carefree secondary school student and lived with his strict father and sawmill labourer Rasu Thevar (Radha Ravi).
Six years later, Jasmine, who had a decent job that paid well, returned to Kodaikanal for her holidays and she came to know about the love letters sent by Subbu.
N. Pandian who had directed the film Priyam (1996) returned with 365 Kadhal Kadithangal under the banner of Vision 21 Creative Team Works.
The film was set in backdrops of Kodaikanal so as to offer a colorful touch to the romantic story but the major portions were shot in Ooty and Kotagiri.