Kamal Haasan, Ambika, Radha
The movie starts with Kamal getting released from prison after serving a sentence on a rape charge. Ambika and Radha are sisters and heirs to a wealthy business. Ambika looks after the business after their parents died while Radha is a student. Kamal meets Radha and soon they fall in love while Ambika has sworn off all men. Jaishankar is their uncle who is after their wealth.
When Radha brings Kamal home to meet her sister, Kamal and Ambika have a big fight which ends is Ambika forbidding Radha from seeing Kamal. Ambika then reveals the reason behind the fight. Years earlier, Kamal and Ambika were classmates: Ambika had a crush on him which Kamal never reciprocated. While on a class trip, Ambika gives a note to Kamal that asks him to meet her in his room. Ambika claims that, that night, Kamal entered her room and they had consensual sex, but Kamal denied it and refused to marry her. So she bought up rape charges against him and sent him to prison.
The truth comes out. During the class trip, Kamal never received the note which fell on Jaishankar’s son, Raj Kumar, who was their classmate. Raj, lusting after Ambika, uses this opportunity to enter Ambika’s room on the pretext of being Kamal and has sex with her. Since Raj disconnected electricity in her room and the room was very dark, Ambika didn’t know the difference.
Kamal forgives Ambika and gets back with Radha while the bad guys are punished.