Thuruppugulan story is focused on Kochuthoma (Innocent) and his son Kunjumon (Mammootty). Kochuthoma is running a typical street side "thattukada" in Kochi. At the age of ten, Kunjumon accidentally injures a person. After the incident when his son faced trouble to stay at Kochi, Kochuthoma sent him to Kozhikode to stay with his dear friend Swami (Jagathy).

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