Kal Ho Naa Ho (2003)
Naina is a very serious girl with a very serious life. But one day, her soul is awakened by the happy-go-lucky Aman, who teaches her that life is meant to be lived. Naturally, she falls in love with him. But Aman is harboring a secret that keeps him from reciprocating Naina's love. But he cannot stand having her live a life without love, so he sets off on a mission to fill her life with someone else's love - someone she already knows...