h_h,

The movie you are talking about is Rojavin Raja. The hero was NT and heroine was Vanishree. This movie started in 1973 got delayed and finally hit the screens by 25th December, 1976. By this time Cho was not in MGR movies and IIRC his last film with MGR was Rickshakaran [1971].

BTW, was it not three Cho s?

Regards