Why Marn guys are interested in Brahmin ladies rather than OBC, SC, ST... This means that karuna and his gang are casteist and they want Upper Caste daughter in laws.. If both parties had interest, only the powerful's (who are at power) interests is supreme and maran brothers are powerful. Caste will be wiped from karuna's family but they will make sure that it is still there in the minds of TN people.
