Hum Tum is a 2004 Indian Hindi-language romantic comedy film written and directed by Kunal Kohli, and produced by Aditya Chopra under the Yash Raj Films banner. The film stars Saif Ali Khan and Rani Mukerji, with supporting performances from Rishi Kapoor, Kirron Kher, Rati Agnihotri, and Jimmy Sheirgill. Loosely inspired by the American film When Harry Met Sally... (1989), the narrative follows Karan and Rhea, two individuals who repeatedly cross paths over several years and form a complex relationship that evolves from friendship into romance.