Vellakuthira follows Kathir, a greedy man whose hunger for wealth drags his family into a financial crisis. Forced to flee after a violent confrontation, Kathir, his wife Kayal, and their son move to their ancestral village, hoping for a fresh start. But old habits die hard - when Kathir discovers a local herbal drink with great market value, temptation strikes again. As he chases profit and the villagers fight against exploitation and neglect, the story unfolds into a gripping tale of greed, redemption, and survival.