Hero Biyon Gemini and heroine Kalyani Nair live in the next doors at Kodaikanal. While the hero falls for the heroine and roams behind her, the heroine does not show any interest on him. Biyon visit her house often and chats with her father just to have a glimpse of Kalyani.
Mean while, police officer Kalabhavan Mani captures a burglar, Karathe Raja, and puts him in prison. One day, when he escapes from the prison the police goes in search of the thief and the people are afraid about his atrocities.
In this situation, heroine Kalyani's father has to leave the town due to some work. So, he requests Biyon to come and stay with Kalyani. Since Kalyani looks very simple, Biyon wishes to see her well dressed with a good make over. Utilizing this opportunity, Biyon makes her faint by giving her a sedative mixed cool drink. He, then, lays her in the bed and goes out to get the needed cosmetics and a silk saree.
When he comes back home, he is shocked to see a man lying unconscious beneath the cot and the heroine in a crying position. Who is the unknown and what happened to him and the reasons behind the simplicity of the heroine are narrated in the second half of the movie.
Hero Biyon gets a pass mark with his looks and performance skills. Heroine Kalyani has to carry out a sorrowful look through out the film. She looks elder to the hero but excels in the romance sequences. Kalabhavan Mani (late) fits well in his character and has done his portions in an appreciable manner. Even the other actor who comes as the father of the heroine has acted well but the character development shown in the second part can not be relished.
Director Majid Abu has taken a thriller film in a different manner but discrediting the father-daughter relationship is not acceptable. Songs are okay with Ganesh Raja's music but the BGMs need improvement. Shakir John's camera works also fall in the same line.
Totally, Pudhusa Naan Poranthen lacks clarity.