Arjunan Kadhali crux of the movie is love and the lovers who strive hard to succeed against the orthodox old generation. The story also deals with the influence love on basic pillar of relationships. Does love happens at first sight or not? Will the lovers adhere to their decisions against parents? How will they face crisis when people of their own society turn their back on them all because of love?

In order to help their boss from a financial crisis, Arjun and Archana manage to find a baby for a crucial ad campaign. However, they are shocked when they learn that the baby is an abductee.