Naan Avanillai stands out for its gripping storyline and sharp screenplay by K. Balachander, which maintains a strong narrative pace throughout. The first half effectively sets up the protagonist's multiple personas and the emotional impact on the women he deceives, while the second half intensifies with courtroom drama and moral dilemmas, keeping the audience engaged.

The film's pacing is well-balanced, with moments of tension and relief interspersed skillfully. The songs composed by M. S. Viswanathan complement the narrative without disrupting the flow, and the background score enhances the emotional and dramatic scenes effectively. Cinematography by B. S. Lokanath captures the mood and period setting with finesse.

Overall, the movie is a compelling blend of drama and social commentary, supported by strong performances and technical finesse. Its music and BGM add depth to the storytelling, making it a memorable classic in Tamil cinema.

Gemini Ganesan: Charismatic and nuanced portrayal of a conman with multiple identities, showcasing his versatility.

Lakshmi: Strong and emotive performance, effectively conveying the pain of betrayal.

Jayabharathi: Convincing and heartfelt, adding depth to the ensemble cast.

P. R. Varalakshmi: Supportive role with credible emotional expressions.

Jayasudha: Notable for her youthful innocence and emotional range.

Kamal Haasan: Brief but impactful appearance, hinting at his future stardom.