Tony Leung Chiu-Wai
In early 1997, Kwan was asked by Hong Kong filmmaker Wong Kar-wai to star in his film "Happy Together". She was flown to Argentina in five days' notice and ended up spending more than two months filming. Starring opposite Tony Leung Chiu-Wai and Chang Chen, Kwan played Leung's mysterious and lonely secret admirer and also recorded a cover of Caetano Veloso's "Cucurucucu Paloma" (Song of Dove) for the film's soundtrack. However, her scenes were all deleted from the final version of the film, for which Wong later went on to win Best Director at the Cannes. It took another three years for Kwan's scenes to surface, when they were included in the making-of documentary, "Buenos Aires Zero Degrees" (). The documentary premiered at the 2000 Berlin International Film Festival out of competition, and was also shown at the 2000 Golden Horse Film Festival and Awards in Taiwan.