The story
For Naina Catherine Kapur (Preity Zinta), a young Indian immigrant living in New York, life is not very cheerful and has never been since the death of her father. Between the constant bickering within her family, originally from Punjab and half Catholic, the attentions required by her little brother and sister, the mood swings of her grandmother and the financial troubles of her mother (Jaya Bachchan) that she tries to help as she can, the girl has no time for herself. She never goes out and does not have the opportunity to enjoy herself. Naina is almost 24 years old, she is a very serious girl and she is quite boring. Her only friends are Sweetu, the dumpling girlfriend who is desperately looking for Prince Charming and Rohit (Saif Ali Khan), the inveterate bachelor who flirts with everyone he meets. It is then that a young man, Aman Mathur (Shahrukh Khan), comes to settle in the neighborhood, which has the effect of a gust of wind from the sea. He helps people solve their problems and cope with their uprooted existence and all are grateful to him. He also tries to help Naina, but the girl becomes irritated by what she considers an intrusion into her private life… Wikipedia 
Technical fact sheet
Director: Nikhil Advani Screenplay: Karan Johar Production companies: Dharma Productions Production country: India Genre: romantic drama Duration 184 min Release 2003 Cast : Shahrukh Khan, Preity Zinta, Saif Ali Khan
Impressions
After Dostoevsky's own introduction, where each character is gracefully presented and put in a very specific context, the film starts in a train station, at least that's where they meet "by chance" and their destiny is forever changed . "Chance", etymologically "the will of God". Are we predestined? And if so, is it possible that the conditions are not met for a love in due form to see the light of day? Could it be possible that by "predestined" we can imagine all kinds of scenarios? Why would this necessarily involve a carnal love story? And they lived happily ever after and had many children… 
Are Naina and Aman predestined? He hears what she confides to his girlfriend and is touched, even upset. Did he receive Cupid's famous arrow at that very moment? For Naina it's different. Her vision of life is too embittered, she is as if anesthetized at the level of feelings because of her suffering. She will have to take off her glasses, that is, she will have to abandon this vision welded by a painful past, to realize her love for Aman. She almost lost her train. Aman and Naina meet "by chance" in this capernaum of movement that is a station, in a crucial moment of their lives where a focus is necessary and their destinies cross forever. Train, metaphor of a passing life. Choices, directions, change. 
Is Aman an angel?One of those ephemeral beings who come to this earth to collect the pieces, to guide a micro cosmos of the lost people who have completely lost themselves? Curiously, he is the only one who is not really introduced. At first, we can't even see his face. Often Aman is there, stands behind the other characters, listens to conversations where we express needs, desires, frustrations, sadness, but we do not always know if he is really there, or if he is just an illusion, a guardian angel ready to execute the slightest desires at the expense of himself. Very moving the scene where the whole family prays on their knees and Aman sees them from his balcony. Aman. Amen. This will be the case. The grandmother does not share the same beliefs. Often we are confronted, not only with the wisdom of the elders but also with their stubbornness. So she doesn't need an angel because probably she wouldn't even see him. Besides, she has had one at home for seven years ready to show him the way to forgiveness, but she does not see it. She feels nothing but contempt for Gia. It is in Aman's hands that the letter revealing the mystery of this adopted little girl falls "by chance". Jennifer who adopts her husband's child, which for her must have been the most difficult situation of her life. Let go of what we can no longer keep, welcome what we are given even if we do not understand the reasons. https://www.youtube.com/watch?v=1BWdglekty0 Rohit who yields to the request of his dying friend, promise me that it will be mine in the next few lives. This could allude to Hindu marriage, whose rite implies that the woman agrees to be the wife of the man for seven reincarnations. This seems to indicate that couples are predestined. So Rohit gives up the next six lives with his beloved. Tomorrow will be or will not be. This is the free translation of Kal Ho Naa Ho. Live the present, because we don't know what tomorrow is made of. And yet Aman does not apply it to himself since, not only does he renounce his beloved but in addition, he directs her to his best friend. He knows that he will die, with the certainty of a death row inmate. He is leaving and does so with a smile and detachment, in unconditional love for Naina. 
Was she finally predestined for Rohit? Aman talks to his beloved reading a blank diary, a book that will never be written, a life that will never be lived. Like a Cyrano de Bergerac, he voluntarily gives his poetry to someone else to deflect a fate that seemed inevitable, the love story between two predestined beings. And he leaves only when his mission is accomplished.
