It seems you're referring to the Tamil film (2004).
M. Kumaran isn't a gangster or a supercop. He's a son. A son trying to win back the one woman who never stopped loving him — his mother. m kumaran son of mahalakshmi movie
And in the end, the courtroom isn't just a legal battle. It's a son proving that a mother's love is the only law that matters. It seems you're referring to the Tamil film (2004)