Satya Murthy, goes to London against his mother's wishes and expresses his love for Caroline there. Caroline is shocked to tell him that he has already been cheated on by someone. At the same time, Ravi tricks Satya's younger sister Yamini in India into falling into his love trap. This puts Yamini's future in trouble. What is the solution to these two incidents is the plot of 'Kannathil Muthamittal'.